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ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast
ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast
Explain Like I'm Five, aka ELI5, is a mini-podcast series that takes questions you've always wanted to ask and explains them in a simple, easy-to-understand way. Inspired by the Reddit community r/explainlikeimfive, each episode breaks down complex topics into bite-sized answers. The show credits users from the subreddit in episode show notes.
Episodes
ELI5 Carbonated Water - why does flat soda still taste like soda?
Why do soft drinks exclusively use carbon dioxide instead of gases like oxygen or nitrogen? Why does "flat" soda still have a distinct taste compared to regular tap water? Why does Perrier extract natural gas from its spring water only to pump it back in later? Does the carbonation in sparkling water affect your body’s hydration differently than drinking regular water? Why do smaller bottles of sp
ELI5 Money Laundering - what, why and how?
What is money laundering? Why can’t a criminal just spend good old fashioned cash? What are some of the ways used by criminals to launder money? Besides casinos, why are laundromats often mentioned? Why are countries like Panama and Cyprus ideal for laundering money?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the following users whose questions
ELI5 National Debt - who do countries owe when they are in debt?
If every major country is in billions of debt, where are they borrowing from? Who exactly do they owe? Are there any consequences for them being in debt? Why is it a problem when it gets large? Why was Greece in trouble, while Japan seemingly has high debt but is fine?
... We explain like i'm five!
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Thank you to the r/explainlikeimfive
ELI5 Royal Family - how does the British royal family make money?
How does the royal family make money? How much is the queen worth? Explain the Soverign Grant and Crown Estate. How much did Harry inherit? What exactly does the Royal family do?
... We explain like i'm five!
Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: youtoo2, pjwils, loki-
ELI5 Flight Delays - how do airports manage major disruptions such as weather cancellations?
When flights get cancelled because of heavy winds, why is it only a proportion of flights and not 100% that stop? Isn’t it a binary decision of: 'safe' or 'too dangerous'? After weather cancels thousands of flights and lots of people are displaced, how to they all get back on schedule when presumably flights for the next few days are already booked up?
... We explain like i'm five!
Thank you t
ELI5 Easter - why the bunny and chocolate eggs?
How is the date for Easter determined each year? Why do we have an Easter bunny and chocolate Easter eggs? Why did Christmas become a bigger holiday than Easter? What animal is often used instead of a bunny in Australia?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion:
ELI5 Helium - is there really a global shortage?
How can "superfluid" helium flow against gravity and climb up the walls of a container? Why was helium discovered on the Sun nearly thirty years before it was found on Earth? How does a gas used for party balloons play a critical role in life-saving MRI technology? Is inhaling helium to make funny voices actually a dangerous risk to your health? If helium is abundant in the universe, how are we "r
ELI5 Cupping Therapy - can bruises really heal you?
Why do we see many professional athletes look like they were attacked by a giant octopus? How did a treatment from ancient history become the biggest trend in modern locker rooms? If a bruise is "stuck" blood, how can it actually help your blood flow? Can we really suck "bad energy" or "toxins" out of our muscles with a glass jar? Why do some doctors call this "quackery" while others say it's a po
ELI5 Crying - why do we cry with both sadness and joy?
Why is crying so much more than just being sad? Why do your lungs perform those jerky gasps once the actual sobbing stops? Why does that painful "lump" form in our throats when the glottis tries to stay open for oxygen while we're trying to swallow? How do emotional tears differ chemically from the ones we use for onions, and do they actually "flush" stress hormones out of the body?
... we explai
ELI5 Norway's Olympics - how tiny Norway conquered the Winter Olympics
How did a country with only 5.7 million people beat much larger countries in Winter Olympic medals? Why does Norway ban competitive scoring and league standings for children under the age of twelve? How can not caring about winning at a young age actually create more world-class Olympic champions? Is it true that people in Norway actually use skiing as a primary way to get around?
... we explain
ELI5 One Way Mirrors - how do they work?
How do one way mirrors allow light to pass in only one direction? If light travels through the glass equally from both sides, why does the simple flip of a light switch create a hidden observer? How does a microscopic layer of aluminum or silver on a piece of glass actually bounce light back to create a reflection? Why does our brain instantly prefer our flipped mirror image over the real perspect
ELI5 Ski Jumping - how do they not get injured when landing?
With such great speeds and a significant vertical drop, how do ski jumpers not sustain injury when landing? What makes one ski jumper better than others? How is a ski jumping course designed? Where is the largest ski jumping hill?
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ELI5 Fire Extinguishers - why are they red in color?
Why is most fire equipment red in color? What happens if you use the wrong class of extinguisher on a grease or metal fire? Could the future of firefighting be a "dubstep cannon" that uses sound waves to kill flames?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: j
ELI5 HRV - what is heart rate variability and why can a steady heartbeat be trouble?
Why does a perfectly steady heartbeat actually serve as a warning sign you should not ignore? If your heart is a drummer, why is a little bit of "bad timing" a good thing? How can your smartwatch tell you are stressed before you even feel it? Why does splashing cold water on your face trigger an ancient, "hidden" survival reflex? Why did Neil Armstrong’s heart race to 150 BPM while his co-pilot st
ELI5 Activity Trackers - how do they detect deep sleep?
What are the creative ways people fool their FitBit? How does my activity tracker differentiate between steps and my tapping to a rhythm? Does it use GPS to calibrate? How does it know what stage of sleep I'm in?
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ELI5 Palladium - more valuable than gold?
Why is a metal you’ve probably never heard of often worth more than pure gold? Why are thieves risking jail just to steal one specific part from a Toyota Prius? What is the "Palladium at Night" satellite doing that no government will admit to owning? How did Ford lose a billion dollars by trying to hoard this "ghost" metal? Could this strange metal be the secret to "cold fusion" and unlimited powe
ELI5 Jevons Paradox – why adding more lanes to a highway can make it worse?
Why does adding more lanes to a highway actually make traffic jams get even worse? How did the machine meant to end slavery accidentally make it ten times more profitable? Why did the invention of the ATM lead to more bank tellers instead of replacing them? Is your "eco-friendly" car actually causing you to burn more fuel than your old one? Why does being the most efficient worker in the office al
ELI5 Titanium - why is it the metal most used in surgeries?
Why did the CIA secretly buy Soviet metal to build the very plane designed to spy on them? How does a metal named after Greek Titans manage to fuse physically with living human bone? If titanium is the ninth-most abundant element on Earth, why is it still so expensive to produce? And how did common chlorinated tap water nearly destroy the manufacturing of the world’s fastest titanium jet?
... we
ELI5 Xmas - how and why NORAD tracks Santa (part 2)?
Why do people in the UK typically say Happy Christmas while in America it is most commonly Merry Christmas? What made red and green Christmas colors? Is it true that Coca-Cola popularized the modern look of Santa Claus? Why do most of our "traditional" Christmas songs, images and TV/movies come from the 1940s to the 1960s? Brian Earl from the Christmas Past podcast joins us to ELI5 a range of Xmas
ELI5 Xmas - why some say Happy Christmas vs Merry Christmas (part 1)?
Why do people in the UK typically say Happy Christmas while in America it is most commonly Merry Christmas? What made red and green Christmas colors? Is it true that Coca-Cola popularized the modern look of Santa Claus? Why do most of our "traditional" Christmas songs, images and TV/movies come from the 1940s to the 1960s? Brian Earl from the Christmas Past podcast joins us to ELI5 a range of Xmas
ELI5 Pearls - how does a grain of sand make such treasure?
What makes a pearl so mesmerizing, and what is it really? What exactly is a pearl made of, and how does it form inside a mollusk? Can a grain of sand truly cause a perfect pearl? What's the difference between a natural pearl and the cultured ones we see today? How do pearls get their stunning array of colors, from soft pinks to deep blacks? What makes certain pearls incredibly valuable, fetching m
ELI5 Bubble Gum - why is it almost always pink?
Did you know bubble gum is traditionally pink simply because the inventor ran out of every other color? Did McDonald’s really try to help kids eat healthier by inventing bubble gum-flavored broccoli? What actually sets bubble gum apart from regular chewing gum?
... we explain like I'm five
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ELI5 Morse Code - what tragedy led to its invention?
What sparked the invention of Morse code, and how did personal tragedy influence Samuel Morse's creation? Is Morse code still used today? How does Morse code rely on timing, and what role do dits and dahs play in understanding messages? Why do some people still feel a connection to Morse code today despite advances in communication technology? How did WWII utilize Morse code for encrypted communic
ELI5 Marble - why does it feel cool to the touch?
What makes marble feel cold to the touch, especially in winter apartments? How does the use of marble in art reflect the cultural values of the civilizations that employed it? What exactly is marble and how is it formed geologically? What role does marble play in ancient Greek architecture, specifically in the Acropolis and its iconic structures? How does the history of marble reveal about human a
ELI5 Aircraft Carriers - why are the runways at an angle?
Why do modern carriers feature an angled flight deck instead of a straight full-length runway like their WWII predecessors? How fast does an aircraft have to go to take off from a carrier? Why don't planes just fall off the front of the ship when they take off? What are the costs and challenges associated with building longer runways on aircraft carriers? What advantages do nuclear-powered aircraf
ELI5 Iron - is body iron different to construction iron?
Is the Iron in our body different from the Iron used in construction? How did ancient cultures use meteoric iron without knowledge of metallurgy? What makes iron such a vital natural resource throughout human history? Why doesn’t iron in our blood react strongly to MRI machines? How does the imaginative concept of ""space swords"" link history and modern mythology around iron?
... we explain l
ELI5 Daylight Savings Time - who thought it was a good idea?
Why do we still change clocks to Daylight Savings Time when so many people dislike it? Who came up with the idea in the first place? Why is there a movement to permanent Daylight Savings Time? Are farmers for or against Daylight Savings Time?
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ELI5 Submarines - how the Titanic was a cover for a US Navy submarine mission
If nuclear submarines can generate their own water and oxygen underwater, why do they need to surface at all? Why are submarine propellers always at the back, while airplane propellers are usually at the front? How did submarines and the US Navy play a part in the discovery of the Titanic?
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Thank you to the r/explainlikeimfive community and in particular the following
ELI5 The Gold Standard - how Isaac Newton helped gold win over silver
What is the gold standard and how did it influence currency value historically? How did the transition from a gold standard to fiat currency shape modern economics? What led to the abolition of the gold standard in the US during the Great Depression? What impact did Executive Order 6102 have on private gold ownership in 1933? How does the US dollar derive its value without being tied to gold? What
ELI5 Locks and Keys - aren't there high chances that two keys are the same?
Did you know a standard lock might have thousands of combination possibilities, yet yours might open someone else's door? How does a master key work such that it can open multiple locks without compromising security entirely? What makes lockpicking more of an art than a science, requiring skill and a deep understanding of how locks function? How can a particular ""jiggle-and-twist"" method sometim
ELI5 Monopoly - was it invented to criticize capitalism or crush friendships?
Did you know that the original Monopoly board was circular as well as made from cloth? How have Monopoly games evolved over the years to create more engaging experiences for players? Can Monopoly actually reflect the negative impact of monopolies in the real world, rather than just an enjoyable pastime? What are some of the most interesting versions of Monopoly?
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ELI5 Ferris Wheels - what inspired George Ferris to invent it?
What inspired George Ferris to create the first Ferris wheel at the Chicago World’s Fair in 1893? How tall was the original Ferris wheel, and what impressive structure did it aim to surpass? What unique challenges did engineers face to build the Ferris wheel, and how did they ensure its safety?
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ELI5 Silica Gel Desiccants - can they be reused?
What exactly are desiccants, and why are they commonly used in packaging? How does silica gel effectively trap moisture in humid environments? Can you explain the nanoporous structure of silica gel that makes it so efficient? Why do some silica gel packets change color when they reach capacity? Is silica gel really safe to use? Can you reuse them?
... we explain like I'm five.
Thank you to the r
ELI5 Sleepwalking - is it dangerous to wake someone in the middle of a sleep walk?
How does sleepwalking work exactly? Are certain people more prone to it? What types of activities can sleepwalkers get up to? Are there specific triggers that cause sleepwalking? Is it true that waking a sleepwalker can be dangerous?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of t
ELI5 Poker - which US president used poker to launch his election campaign?
How did Poker evolve into a cultural phenomenon beyond just a card game? What makes poker different from other casino games in terms of player competition and strategy? Can you explain the betting process in poker and how players make decisions during each round? Poker on TV often shows those probabilities of a winning hand. How do players calculate this when they're playing? Are there some standa
ELI5 Washing Machines - more consequential than the internet?
What makes washing machines such a vital household invention in the modern world? How did washing machines transform household chores from 8-12 hours to a fraction of that time? Could you explain the role of water temperature in washing effectiveness and fabric care? Why do some fabrics, like suits, require special cleaning methods instead of traditional washing machine cycles?
... we explain li
ELI5 LiDAR - how it sees the world?
What is LiDAR? Why is it helpful in addition to seeing things through cameras? How does LiDAR time-of-flight measure distance when light travels so fast—what tricks give picosecond precision? Why can LiDAR detect single-photon returns from angled surfaces, yet mirrors and shiny objects cause false readings? What are some surprising places LIDAR is used that most people wouldn’t expect?
... we exp
ELI5 Deck of Cards - why 52 playing cards and why so mysterious?
How did we end up with the deck of cards that we use today? Did the standard 52-card deck derive from Tarot cards, and what does that mean for gameplay? Is it true that shuffling a deck creates a unique order that has likely never existed before? Can you explain the concept of 52 factorial and why it matters for card arrangements? What fascinating social dynamics emerge around shuffling cards and
ELI5 Gout - what is it and why is the big toe a target?
What is gout, and how does it uniquely affect your body compared to other forms of arthritis? Why does gout primarily affect the big toe? How do uric acid crystals form, and what role do diet and lifestyle play in this painful process? Can hydration truly prevent gout attacks, and what are the risks of dehydration for those already affected by it? What about Epsom salt? How does it assist in allev
ELI5 Rubiks Cubes - how do some people solve it in seconds?
How do competitive solvers manage to solve a Rubik's Cube in under 10 seconds, and what techniques do they use? What is the relationship between memorization and pattern recognition for record-breaking cube solvers? How do solvers memorize moves to successfully solve the cube blindfolded, and what techniques assist them in this process? How does the concept of ""God's number"" relate to the Rubik'
ELI5 Toilets - why are public toilets tankless unlike those at home?
Why do home toilets typically have tanks, while public toilets often don't? What are some benefits of tankless toilets in public spaces from a design perspective? What is the S bend there for and how has this toilet design influenced modern plumbing? What are the implications of Hong Kong using seawater for toilet flushing in a densely populated city? What toilet innovations do you find most signi
ELI5 Black Box Flight Recorders - what’s inside the orange mystery?
Why are airplane black boxes not connected to real-time satellite data systems? What data does a black box contain and how does it contribute to improving aviation safety after an accident is investigated? How do black boxes manage to survive catastrophic accidents and remain so resilient under extreme conditions? What makes flight recorders, or ""black boxes,"" so crucial after airplane accidents
ELI5 Wine - which came first, wine or beer?
Which came first, wine or beer? Is it true that the birthplace of wine is Georgia, not France or Italy? Can any wine truly age forever, or does it have a finite lifespan where quality peaks and then diminishes? Why did California wines triumph in the Judgment of Paris, and what does this say about blind taste tests?
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ELI5 Beer - why it was central to historical society?
How did ancient sailors rely on beer for hydration? What does history tell us about alcohol's role in survival? Why was beer so essential for laborers in ancient Egypt, especially during pyramid construction? Why is beer considered more important than other alcoholic beverages in historical contexts?
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ELI5 Creatine - what makes it so popular and does it really make you stronger?
What is creatine, and how does it work in our body during high-intensity activities like sprinting or weightlifting? Did you know creatine boosts ATP production, our body's immediate energy source, amplifying performance in short, intense workouts? What unique role does creatine play in muscle recovery and growth, especially regarding myosatellite cells? Is it true that creatine can lead to an inc
ELI5 Induction Stoves - are they really faster than gas stoves?
Are induction stoves quicker than gas stoves? How does using an induction stove compare to using gas or conventional electric stoves? What is the secret behind how induction stoves can boil water so quickly? Can you explain how induction cooktops heat pans without heating themselves? Do induction stoves require specific cookware for efficient cooking?
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ELI5 Muscle Knots - do muscles really get in knots and what causes them?
What is really going on when you get a bump in your back or neck muscle that hurts when you press on it? Do muscles really get knots? How do they form? Why are they not detected in scans like x-rays or MRIs? Why do deep tissue massages sometimes make them feel more sore? What are ways to prevent muscle knots?
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ELI5 Berries - is the banana really a berry?!
What surprising fruit is botanically classified as a berry but often confuses people in everyday conversation? How do the definitions of ""berry"" and ""fruit"" differ between botanical science and everyday cooking? Did you know that watermelons, tomatoes, and cucumbers are also classified as berries? What implications does this have for our cooking? Can you share some mind-boggling examples of fr
ELI5 Paper Sizes - why paper sizes in the US are different?
What’s the historical reason for the U.S. using "Letter" paper size over the international standard A4 paper? What inconveniences do people face in North America due to the different paper sizes compared to the rest of the world? How does the unique aspect ratio of A4 paper help in scaling paper without wasting space? What about B and C format paper?
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ELI5 Defibrillators - why AEDs at malls differ from those on TV?
What exactly is a defibrillator? Why is the analogy of jump starting a car incorrect? What’s happening in the heart when a shock is delivered? What is the AED and how do you spot one in public? What happens when you activate an AED? Who invented it?
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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments forme
ELI5 Dragons - why do dragons exist across almost every culture?
Why do dragons capture our imagination across different cultures and eras when it isn't a real creature? What psychological factors contribute to our collective fascination with dragon legends around the world? What fascinating connections exist between ancient civilizations and the stories of dragons they created? Why do dragons symbolize chaos in the West but represent good fortune in cultures l
ELI5 Invisalign – are they better than braces?
Could jaw surgery be the faster solution for realigning teeth, and what are the risks? How exactly does wearing Invisalign gradually shift your teeth into the desired position? What’s the biggest misconception people have about Invisalign compared to traditional braces? How has aggressive direct-to-consumer marketing made Invisalign a household name despite its origins? What role does 3D printing
ELI5 Stoicism - what are the four Stoic values?
What is Stoicism, and how does it apply to our modern lives today? How does Stoicism differ from popular self-help interpretations of its principles? Can you explain the four key Stoic virtues: Wisdom, Courage, Temperance, and Justice? What makes Stoicism relevant during challenging times, such as the recent pandemic? How can mastering emotions enhance our practice of Stoicism in daily life?
...
ELI5 Panama Canal - why did the original French attempt fail?
What makes the Panama Canal’s lock system so essential compared to the Suez Canal’s lack of locks? How do locks help manage the canal’s significant elevation change across mountainous terrain? Why was constructing a wide trench connecting the Pacific and Atlantic oceans deemed too complicated and risky? Why did the U.S. ultimately choose Panama for the canal after initially considering Nicaragua a
ELI5 Blood Types - do animals have different blood types just like humans?
What fascinating adaptations led to the evolution of diverse blood types in humans over millennia? How does our immune system interact with foreign entities to determine blood type responsiveness? Why is Type AB blood considered rare, and how does intermixing populations contribute to its existence?
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ELI5 Fish Oil - if it’s so good for you, why not use it more for cooking?
Does fish oil actually help? What makes it help? What are the specific types of Omega-3 that are good for you? If it’s so good for us why not use it more for cooking? Why are there some eggs that have Omega-3 on the label?
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ELI5 Traffic Lights - why not use pressure sensors?
How intelligent are traffic light systems? What sensors are used? Why not use pressure sensors under the pavement? How do traffic systems coordinate across intersections in a city? Do emergency services like fire trucks and ambulances have the ability to control traffic signals?
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ELI5 GPUs - why are they better than CPUs for artificial intelligence?
What distinguishes CPUs from GPUs in architecture, and how does this impact their performance in computing tasks? Why are GPUs considered better at handling tasks like graphics rendering compared to CPUs? How do different rendering techniques in games versus offline programs affect the processing demands on CPUs and GPUs?
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ELI5 Sunrise - why do sunrise and sunset look different?
What makes sunrises and sunsets visually unique experiences despite being technically the same phenomenon? Why do atmospheric conditions lead to warmer reds during sunsets and cooler blues during sunrises? How do variations in dust, humidity, and pollution change the colors we perceive at sunrise versus sunset?
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ELI5 Sliced Bread - why is it the greatest thing since…
What makes sliced bread the “greatest thing since” anything? How did the invention of sliced bread in 1928 change consumer habits? Why do traditional French and Italian breads mold faster than commercially sliced bread?
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ELI5 Nautical Miles - why are they different from the regular mile?
We explain the fascinating concept of nautical miles, an essential unit for navigating our oceans. What exactly is a nautical mile, and how does it relate to the way we navigate? How does a nautical mile differ from the standard road mile we’re used to, and why does this difference matter for sailors and pilots? What practical advantages does using nautical miles provide in terms of ease of naviga
ELI5 AA Batteries - how did AA type batteries become standard and what about the A battery?
What makes AA batteries the go-to choice for so many devices when alternatives exist? Why do we have so many different battery sizes like AA, AAA, C, and D? What led to the standardization of battery sizes in the 1920s? Why do some devices require two AA batteries instead of just one? What factors contribute to the performance difference between name-brand and generic batteries?
... we explain li
ELI5 Meditation - Can meditation really change your brain?
How does meditation physically alter our brain’s grey matter? Is it true that the amygdala shrinks after mindfulness meditation? How do Tibetan monks increase body temperature through meditation? What training techniques enhance focus and mental stamina through meditation? How does meditation compare to other stress-relief practices, like exercise or art?
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Thank you t
ELI5 Wolves - why are there big cats but not big dogs in the wild?
Why are there big cats but not big dogs in the wild while there are lots of big cats? Why are wolves so hard to tame? How were prehistoric men able to domesticate wild wolves? How have wolves been portrayed in different cultures and mythologies throughout history?
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ELI5 E. Coli - what is it and why isn’t it all bad?
What exactly is E. coli, and why should we care about it? Why is it used a lot in scientific research? What does E. coli pop up often in food contamination cases? What are the symptoms? What are some notable outbreaks?
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ELI5 Schrödinger's Cat - is the cat both dead and alive and why does it matter in quantum mechanics?
Explain Schrödinger's Cat in simple terms. Why did Erwin Schrödinger propose this thought experiment in the first place? What was Schrödinger trying to argue against with his cat example? Which other scientist inspired Schrödinger to devise the cat?
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ELI5 Rare Earth Metals - why they aren’t actually rare?
What makes these metals so special and why are they called ‘rare’? What technologies are they used in? Why are they so hard to substitute? Where are they found geographically? What about unobtanium and adamantium?
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ELI5 LASIK - how exactly does it fix your vision?
What exactly is LASIK, and how does it differ from other vision correction procedures? Is it painful? How does it differ from PRK as a procedure? How does the cornea heal after a LASIK procedure if there is no blood flow going to the cornea? Which celebrities have famously had LASIK surgery?
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ELI5 Ligers, Lions and Tigers - who would win in a fight?
Why are Ligers larger in size than both Tigers and Lions? Why can only certain species interbreed? Why are Lions and Tigers polar opposites in terms of their character and physical attributes? Lions and tigers have a significant cultural presence in art, literature, and media. How do these representations influence public perception in different countries? Who would win in a 1 on 1 fight between a
ELI5 Wasabi - is most wasabi really “fake” outside of Japan?
What exactly is that sensation we feel with wasabi? Is it the same as the heat from chili peppers? Why does it go straight to the nose? How does it differ from similar foods like mustard and horseradish? Is wasabi outside Japan really fake? How do you tell if it’s real? Why is it paired with sushi?
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ELI5 Spicy Food - if water is not a good antidote, what is?
Ever wondered why biting into a chili feels like setting your mouth on fire? Is it a taste or is it something else entirely? Why do some people seek out this fiery sensation? Can you build spicy food tolerance? Does drinking water help deal with the spice? Is there a limit to how spicy food can get? What are the hottest peppers out there?
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ELI5 Rubber Bands - why do they become brittle over time?
What are rubber bands actually made of? Why do they become brittle over time? Why is it near impossible to let go of a stretched rubber-band with both hands at the same time? Which drug cartel was spending a reported $2500 per month on rubber bands?
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ELI5 Mint - why it became associated with freshness?
How is spearmint and peppermint different? How did mint become associated with freshness and cleanliness in products like toothpaste and gum? Why does mint create that feeling in our mouths? Why do mint and citrus flavors clash?
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ELI5 Black Friday - why is it called Black Friday?
Why is it called Black Friday? Why is thanksgiving itself always on a Thursday? Was Macy’s the first American department store to sponsor a parade in celebration of Thanksgiving? How did American football become such a big part of the thanksgiving tradition? Is it true that the day after Thanksgiving is the busiest day for plumbers?
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ELI5 Myopia - why can’t you buy myopia glasses off the shelf like reading glasses?
How common is myopia around the world? Is it caused by genetics or lifestyle? How has myopia evolved with human activities? In aAmerican drug stores you often see a wide variety of reading glasses. Why are there no pre made options for myopia or near sighted people?
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ELI5 Volcanoes - can they be used for dumping trash?
Why can't we just throw our trash into volcanoes to incinerate it? Why do some volcanoes erupt explosively while others have gentle lava flows? Why is Yellowstone National Park considered a super volcano? Which volcano created the loudest sound ever recorded? Can we use volcanos as energy sources?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the fol
ELI5 Lab Grown Diamonds - why do they have lower resale values?
How are lab grown diamonds made? Are they exactly the same? Why do they have different prices and resale values? Which is more environmentally friendly? How have cultural and social attitudes evolved?
... we explain like I'm five
Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: pahpichulo, greenst
ELI5 MRIs - how do they work and why are they so noisy?
How do MRIs work? Why are they so expensive? Why are they so noisy? Are MRIs related to other scans like x-rays, CT scans and PET scans? Why aren’t full body MRIs more part of routine checkups? Why are they so expensive? If there is iron in our blood, is this affected by the magnetic fields in an MRI? Why was there controversy with the nobel prize awarded for MRI technology?
... we explain like I'
ELI5 Aircraft Engines - why propellers on military planes vs jet engines?
Why do military planes like the Hercules C-130 and Airbus A400M military transport planes use propellers instead of jet engines? What makes them more versatile for shorter runways? Why is a turboprop engine not the same as regular piston propeller engines? Explain the difference between a turbojet, turbofan and turboprop.
... we explain like I'm five
Thank you to the r/explainlikeimfive community
ELI5 Speed of Light - why can’t we exceed it?
How did we even measure it if it’s so fast? Why can’t anything go faster than the speed of light? If I were to take a really really really (light years) long stick and push something on the end of it, would it happen “instantly”? What are some of the loopholes that would allow us to theoretically exceed the speed of light?
... we explain like I'm five
Thank you to the r/explainlikeimfive community
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