SciShow
How Rare Are Extra Organs?
- Title
- How Rare Are Extra Organs?
- Date posted
- 5 months ago
- Description
- Some people are born with more to love. More organs, that is. from double uteruses to bonus blood to extra spleens, here are a few ways you can have extra pieces of yourself, and what to do with your bonus body parts.
Hosted by: Hank Green (he/him)
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- Title
- How Radioactive Is Marie Curie’s Lab Today?
- Date posted
- 5 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
There's a radioactivity museum in Paris, in Marie Curie's lab. It's still got radiation in there. But Andra has removed the worst of it.
BBC story: https://www.bbc.com/future/article/20250605-the-hunt-for-marie-curies-radioactive-fingerprints-in-paris
Hosted by: Rose Bear Don't Walk (she/her)
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- Title
- Mongols Attacked And The Earth Fought Back
- Date posted
- 6 months ago
- Description
- Check out Manta Sleep here https://tinyurl.com/yuyzxkx6 and make sure to use SCISHOW for 10% off your order! And then, take a nap!
The Mongol soldiers invaded places as far away as Hungary and Japan. But when they were unsuccessful, paleoclimatologists have found that weather had often interfered.
Hosted by: Hank Green (he/him)
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Jaap Westera, Alex Hackman, Blood Doctor Kelly, Toyas Dhake, Matt Curls, Piya Shedden, Jason A Saslow, Kevin Knupp, J.V. Rosenbalm, Garrett Galloway, Steve Gums, David Johnston, Bethany Matthews, Chris Curry, Chris Peters,...
- Title
- The Quantum Quest for a Perfectly Random d20
- Date posted
- 6 months ago
- Description
- Start, restart, or continue your college journey with Study Hall! Take a college course that starts on YouTube and earn credit before you even apply to college. Go to https://link.gostudyhall.com/scistats to learn more.
Have you ever wanted to put your virtual d20 in "dice jail" after an unlikely series of truly terrible rolls? Does Spotify's latest shuffle algorithm not seem random enough to you? This episode is all about RNGs and random number generation — why we don't always want true randomness, and how we can get truly random numbers when we do.
Hosted by: Hank Green (he/him)
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- Title
- The Priest Who Stole China's Biggest Secret
- Date posted
- 6 months ago
- Description
- Use code scishow at https://incogni.com/scishow to get an exclusive 60% off.
For centuries, Europeans were obsessed with Chinese porcelain but couldn't figure out the secret recipe for it. So a French priest traveled there to steal it.
Hosted by: Madelyn Leembruggen
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Jaap Westera, Alex Hackman, Blood Doctor Kelly, Toyas Dhake, Matt Curls, Piya Shedden, Jason A Saslow, Kevin Knupp, J.V. Rosenbalm, Garrett Galloway, Steve Gums, David Johnston, Bethany Matthews, Chris Curry, Chris Peters, Chris Mackey, Jeremy Mattern, Adam Brainard, Kevin Bealer,...
- Title
- Could You Kiss a T. rex?
- Date posted
- 6 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
In this world, there are so many unanswerable questions. What's the meaning of life? Where did my car keys go? Could I make out with a T. rex? And fortunately, science can help with that last one. Here's what we know about the king of dinosaurs and its ability to plant one on you.
Hosted by: Rose Bear Don't Walk (she/her)
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- Title
- Mirror Bacteria Could Destroy All Life As We Know It
- Date posted
- 6 months ago
- Description
- In December 2024, 38 scientists teamed up to issue a warning about a potential upcoming global catastrophe. The cause? Mirror bacteria. No, these aren't bacteria with tiny goatees from an evil Star Trek universe, but if scientists ever do manage to make them, we might find ourselves living in a disaster movie.
Hosted by: Hank Green (he/him)
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Jaap Westera, Alex Hackman, Blood Doctor Kelly, Toyas Dhake, Matt Curls, Piya Shedden, Jason A Saslow, Kevin Knupp, J.V. Rosenbalm, Garrett Galloway, Steve Gums, David Johnston, Bethany Matthews, Chris Curry, Chris Peters,...
- Title
- Alexander The Great Was Killed By A Mosquito
- Date posted
- 6 months ago
- Description
- To get 15% off your unique gifts this year, go to https://www.uncommongoods.com/SCISHOW
Pope Sixtus V, Oliver Cromwell, Charles Leclerc, Asha Patel, Alexander the Great, and countless other hugely influential people died from mosquito-borne illnesses. Here are their stories and how we know them.
Hosted by: Savannah Geary (they/them)
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Jaap Westera, Alex Hackman, Blood Doctor Kelly, Toyas Dhake, Matt Curls, Piya Shedden, Jason A Saslow, Kevin Knupp, J.V. Rosenbalm, Garrett Galloway, Steve Gums, David Johnston, Bethany Matthews, Chris Curry, Chris Pe...
- Title
- Everything You Didn't Want to Know About Viruses | Compilation
- Date posted
- 6 months ago
- Description
- Go to http://complexlylearnathon.com to check out the Learnathon schedule and support our cool stuff!
They may not be our favorite thing to think about, but viruses have shaped our lives for thousands of years. In this SciShow compilation, we explore the most surprising things about them—including the debate over whether they're even alive.
Hosted by: Reid Reimers
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- Title
- Live-stream SciShow TTRPG
- Date posted
- 6 months ago
- Description
- Adventure called, and valiant members of Team SciShow and Friends have answered! Tune in for a special TTRPG event featuring some of the crew behind your favorite SciShow (and Crash Course!) videos as we explore, puzzle, and fight our way through a custom one-shot. Who knows what curiosities we may encounter…?
Get the SciShow Dice! https://complexly.store/products/scishow-dice-set-complexly
The SciShow team is playing Lasers & Feelings, a RPG by John Harper: https://johnharper.itch.io/lasers-feelings
Learn more about the Learn-a-thon at https://complexlylearnathon.com/
- Title
- Your Coffee Mug is a Physics Disaster
- Date posted
- 6 months ago
- Description
- Go to http://complexlylearnathon.com to check out the Learnathon schedule and support our cool stuff!
Coffee spills more than most beverages. And it all comes down to an unlucky connection between your walking pace, the cup, and that tasty morning brew.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- We Forgot How to Cure Scurvy 7ish Times
- Date posted
- 6 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
You've probably heard of scurvy and think of it as that weird sickness pirates get. But the thing is, for most of human history, we've had a cure for scurvy and known all about it. We just forgot about it. Like, five times. Here's the story of the many times that we forgot about scurvy.
Hosted by: Savannah Geary (they/them)
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- Title
- Lying and 6 Other Things Babies Learn Early
- Date posted
- 6 months ago
- Description
- As a human, there are a lot of critical skills you have to develop to go from a completely dependent potato (better known as a baby) to a fully functional, self-aware person. But when did you acquire them? When did you learn to lie, or internalize the concept of possibility? Science has a pretty good idea!
Hosted by: Hank Green (he/him)
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- Title
- The Best Birthstone (According to Science)
- Date posted
- 6 months ago
- Description
- JMP offers a 30-day free trial for anyone, anywhere. Go to https://www.jmp.com/scishow to see the benefits of visual statistics for yourself.
The modern concept of birthstones might have started as some kind of marketing ploy, but that doesn't mean the only thing these gems are good for is decoration. Let's walk through all 12 months of the year to find what else you can do with aquamarine, peridot, opal, and more!
Hosted by: Savannah Geary (they/them)
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- Title
- 6 Places with Weird Human Mutations
- Date posted
- 6 months ago
- Description
- Go to http://complexlylearnathon.com to check out the Learnathon schedule and support our cool stuff!
There are a lot of places, conditions, and situations that just don't seem all that survivable for most people. But for certain populations of humans, conditions that would be fatal for most of us are no sweat. Here are a few of these super-powered human populations, from altitude masters to deep-diving champions to poison-proof people.
Correction:
14:50 This should be Gah-NAY-an
Hosted by: Savannah Geary
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- Title
- The 500-Year-Long Experiment
- Date posted
- 6 months ago
- Description
- Go to http://complexlylearnathon.com to check out the Learnathon schedule and support our cool stuff!
Most science experiments take a few months or years, but some take a whole lot longer. Here are six of the longest-running experiments of all time, including one expected to last 500 years.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- How The Demon Core Killed a Man in 9 Days
- Date posted
- 6 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
It looked like a boring metal ball. Shiny, silvery, and roughly the size of a grapefruit. But in two separate lab accidents, it took the lives of Harry Daghlian and Louis Slotin without either of them touching it. But it didn't have to, because this ball, later named the Demon Core, was made of plutonium.
Hosted by: Savannah Geary (they/them)
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- Title
- Ozempic Is Both Better And Worse Than You Think
- Date posted
- 6 months ago
- Description
- Semaglutide, the drug famously sold under brand names like Ozempic and Wegovy, has boomed in popularity in just a handful of years. It’s not limited to doing just one thing inside your body… making it a double-edged sword with both benefits /and/ risks. We’re starting to learn what all those things are, and while some of it is great, some of it is less great. So here are 5 things they’re not telling you about semaglutide.
Hosted by: Hank Green (he/him)
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- Title
- Will Humanity Ever Reach 1 on the Kardashev Scale?
- Date posted
- 6 months ago
- Description
- Go to http://complexlylearnathon.com to check out the Learnathon schedule and support our cool stuff!
If you've heard of the Kardashev Scale, you might be a fan of Sci-Fi. Or maybe you're just interested in when Earth will achieve that elusive Type 1 status. But since its inception, people who aren't Kardashev have had the opportunity to iterate on his original idea...from thinking about where blue whales fall on the Scale, to thinking up entirely *new* scales to describe humanity's relationship with the world around them.
Hosted by: Hank Green (he/him)
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- Title
- Was the Trojan War Fought Over a Rock?
- Date posted
- 6 months ago
- Description
- According to legend, Helen of Troy was so beautiful that her face launched a thousand ships, leading to the Trojan War more than 3000 years ago. But other stories suggest that it might not have been her face, but her /jewelry/ that was the key to her desirability. This month's SciShow Rocks Box subscribers will get their own piece of Helen of Troy's famous bling: Corundum.
Hosted by: Reid Reimers (he/him)
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- Title
- We’ve Lost Control of AI
- Date posted
- 6 months ago
- Description
- If you find these trends concerning and you want to make a difference, you can go to http://controlai.com/scishow, where ControlAI has created tools to help you easily voice your concerns to your lawmakers in less than a minute. ControlAI is a non-profit working to keep humanity in control of AI by mobilizing everyone from concerned citizens to experts to raise awareness of the risks of superintelligence and push for international action to address them.
Artificial intelligence is making its way into every corner of our world. But when leaders in the AI space raise concerns, it's helpful to know what they're worried about. Here's how AI works today.
Hosted by: Hank Green (he/him)
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- Title
- Bagged Salad Shouldn’t Exist
- Date posted
- 6 months ago
- Description
- Check out Manta Sleep here https://tinyurl.com/yuyzxkx6 and make sure to use CODE for 10% off your order! And then, take a nap!
You might not know it, but that bag of salad greens in your fridge is a lot cooler than meets the eye. There's decades of engineering, plant science, and technology in those crinkly layers, all keeping your kale as green as it was when it was picked. Here's some of the fascinating science inside your crisper drawer.
Hosted by: Madelyn Leembruggen
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- Title
- 5 Scary Science Headlines You Don't Need To Worry About
- Date posted
- 6 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
There are a lot of scary science stories that go around the Internet. It's easy for a single paper to get spun up into a media frenzy, and harder for the level-headed truth to prevail. From dangerous chemicals in your spatulas to the dangers of intermittent fasting, here are a few of the biggest, scariest stories that went around lately, and why you don't need to worry about them.
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- Title
- Rock, paper, scissors to defend alchemy
- Date posted
- 6 months ago
- Description
- Our latest Deep Dive on Sir Isaac Newton's complicated history with alchemy is live now.
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- Title
- The First Human Bladder Transplant Just Happened
- Date posted
- 6 months ago
- Description
- Mark your calendars and go to http://complexlylearnathon.com to check out the schedule of events!
We've been transplanting human hearts and lungs for decades, but only JUST transplanted the first human bladder in 2025! Here's what took so long.
Hosted by: Savannah Geary (they/them)
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- Title
- How to Make Fair DnD Dice from ANY Shape
- Date posted
- 6 months ago
- Description
- Try Rocket Money for free: https://rocketmoney.yt.link/fjwdHDO
DnD (a.k.a. Dungeons and Dragons) is a game famous for having its players roll a bunch of differently shaped dice, from the classic d20 to the atypical d3. To people used to rolling a bunch of 6-sided cubes, this might seem a little weird. But thanks to one new computer model, there's a way to make them look even weirder, and still be fair!
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- Title
- The Terrifying Physics of Shaking Hands With an Alien
- Date posted
- 7 months ago
- Description
- Mark your calendars and go to http://complexlylearnathon.com to check out the schedule of events!
This riddle posed by Richard Feynman sounds silly, but the answer contains one of the most important discoveries in physics.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- A Researcher Hid This Fossil For Decades. Here’s Why
- Date posted
- 7 months ago
- Description
- In 2002, a research team discovered one of the oldest human ancestors ever, called Sahelanthropus. For over twenty years, most people thought that all they found was a skull. But a few researchers, sworn to secrecy by their peers and the norms of the field, knew that there were more. Here's the story of academic subterfuge, investigative reporting, and some full-on norm-shattering that ended up showing the world the femur of Toumaï.
Hosted by: Reid Reimers (he/him)
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- Title
- FULL METAL ALCHEMY (ft. Sir Isaac Newton)
- Date posted
- 7 months ago
- Description
- Our latest Deep Dive is live NOW!
It's about F̶u̶l̶l̶ ̶M̶e̶t̶a̶l̶ ̶A̶l̶c̶h̶e̶m̶y̶... real life alchemy and how the alchemists of history were conducting experiments, making observations, and drawing conclusions... essentially they were scientists, and this is the story of one of the most famous ones you've definitely heard of: Sir Isaac Newton.
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- Title
- 5 Animals That Are Thriving in the Human Hellscape
- Date posted
- 7 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
Humans have made a hellscape on Earth with climate change, deforestation, and everything else we've done to this planet. Many animals are going extinct from those effects. But some beat the odds and adapt to be better off than before!
Hosted by: Reid Reimers (he/him)
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- Title
- You Stop Glowing When You Die
- Date posted
- 7 months ago
- Description
- You might not be a firefly (or any other creature known for its bioluminescence), but you too do glow. Some of that glow is simply because you're warm. But at visible wavelengths, most of that glow comes from being alive. It's just really, *really* hard to detect.
Hosted by: Savannah Geary (they/them)
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- Title
- We Still Don’t Know Why We Walk on Two Legs
- Date posted
- 7 months ago
- Description
- Use code scishow at https://incogni.com/scishow to get an exclusive 60% off.
You might take it for granted, but the human ability to walk on two legs is pretty special. It's been argued that basically everything we can do today stems back to the time our ancestors decided to start walking upright, so researchers want to know everything we can about it. And here's the story of how one tiny fossil toe from a hominin called Ardipithecus ramidus upended decades of research into bipedalism.
Hosted by: Hank Green (he/him)
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- Title
- In Defense of Alchemy
- Date posted
- 7 months ago
- Description
- Alchemy might seem to us like the dark, shameful side of chemistry. Yet alchemists, through the pursuit of turning lead into gold via transmutation, were sincerely trying to understand how the world works. And no one shows it better than the great Sir Isaac Newton himself. In this SciShow Deep Dive, learn how alchemy has always been a science.
This video was made possible by the Alfred P. Sloan Foundation. To learn more, head to https://sloan.org/programs/public-understanding
Order your alchemy-themed t-shirt, and all SciShow merch here: https://complexly.store/collections/scishow
Special thanks to Dr. William Newman and Dr. Justin Sledge (https://www.youtube.com/@TheEsotericaChannel)
Hosted by: Tom Lum (he/him)
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- Title
- Nuclear Bombs Made Art Forgery Way Harder
- Date posted
- 7 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
Peggy Guggenheim purchased a painting she believed to be by the famous artist Fernand Leger. Almost immediately, there were questions about its authenticity. But it took 40 years and an unlikely group of art detectives to solve the mystery.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- How To Catch a Criminal (with Science!) | Compilation
- Date posted
- 7 months ago
- Description
- We know you can't stop watching true crime shows right before you go to sleep. So here's the SciShow edition. Don't worry, there's plenty of murder investigation.
Hosted by: Savannah Geary (they/them)
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- Title
- There Are Two Kinds of Curious
- Date posted
- 7 months ago
- Description
- JMP offers a 30-day free trial for anyone, anywhere. Go to https://www.jmp.com/scishow to see the benefits of visual statistics for yourself.
If you're dreading losing your spark as you age, the science suggests you don't have to worry. Staying curious is associated with less cognitive decline. It just might look different from your youthful curiosity.
Hosted by: Hank Green (he/him)
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- Title
- The Weird Connection Between Antidepressants and Cancer
- Date posted
- 7 months ago
- Description
- You might think that antidepressants are only for your brain. But there’s research to suggest that antidepressants may be able to help with stuff like cancer. Yes, for real – here's how.
Hosted by: Hank Green (he/him)
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- Title
- Yes, It Really Does Rain More on Weekends
- Date posted
- 7 months ago
- Description
- Does it seem like your workweeks are full of bright sunny days and then every weekend, every time you make plans, it rains? It's not just you -- at least if you live in the Northeastern US, it really does rain every weekend. The reason is the jet stream -- here's how it works.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- This Is Where We’re Gonna Bury The ISS
- Date posted
- 7 months ago
- Description
- In the middle of the South Pacific lies Point Nemo: the most remote location on Earth. This super isolated spot is home to a graveyard filled not with human remains, but hundreds of broken up spacecraft and satellites. And after more than five decades of dumping our space junk there, some scientists have started to worry about the consequences.
Correction:
1:25 Our label says "Africa," but that's actually South America. It is the South Pacific Gyre after all! Thank you to everyone who pointed this out.
Hosted by: Hank Green (he/him)
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- Title
- How Much Information Can A Human Head Hold?
- Date posted
- 7 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
How much information can a human brain store? If we treat them like computers, one estimate is that they can hold 55 million ebooks worth of information. But why restrict ourselves to biology? If you had the right technology, how much information could you pack inside a human head?
Hosted by: Savannah Geary (they/them)
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- Title
- Joseph Stalin Was Very Wrong About Agriculture
- Date posted
- 7 months ago
- Description
- Soviet agronomist Nikolai Ivanovich Vavilov was obsessed with plants. Especially finding out where domesticated crops first came from. And out of his research came a proposal that certain crops, like rye and oats, were evolutionary accidents. Stalin didn't particularly like that idea.
Hosted by: Savannah Geary (they/them)
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- Title
- The Most Important Invention Ever Is... Glue
- Date posted
- 7 months ago
- Description
- There's one human innovation that's so critical to our lives that every modern human group seems to have it. And you probably have some in your craft drawer - it's glue! Turns out there's a long history of glue-making that cements it as a foundational invention for all kinds of human innovations, from weapons to art to medical adhesives. No wonder it's stuck around for so long!
Hosted by: Savannah Geary (they/them)
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- Title
- The Ancient Stick Maps That Tackle Unsolvable Physics
- Date posted
- 7 months ago
- Description
- When particle physicist John Huth was briefly lost at sea, he started to wonder how the people around the world who navigate vast oceans figured their way around. What started as an afternoon activity gone awry led him to a years-long research journey, meeting many Pacific Islanders, expert navigators, and other researchers, hoping to crack the puzzle of open ocean navigation. And the key to all of it lies in these ancient stick charts, a non-writing form of communication passed down for generations. Here's how these charts and the observations of expert navigators are teaching physics researchers all about the motion of the ocean.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- How Dogs Can Help Us Prevent Cleft Palates
- Date posted
- 7 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
Even though cleft lips and palates are really common, there's still a lot of research that needs to be done into why they form. But scientists have found a whole new line of evidence that might crack the case wide open, and it's in dog DNA. Here's the story of how the Turkish Pointer may be able to point us in the direction for understanding how and why clefts form.
Hosted by: Stefan Chin (he/him)
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- Title
- Why Did These Ancient People Abandon Copper?
- Date posted
- 7 months ago
- Description
- Most cultures who developed metalworking technology never let the skill go to waste. But in what's now Michigan, Native Americans started making metal tools well before anyone else did, and then stopped. And the reason why this happened is hiding in the very metal that they were working: Copper. Thanks to Alexis Dahl for joining us on this episode. Check her out on YouTube here: https://www.youtube.com/alexisdahl
If you want to learn more about SciShow Rocks Box, head over to complexly.store/rocks
Hosted by: Savannah Geary (they/them) and Alexis Dahl (she/her)
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- Title
- Cold Doesn’t Exist (And 4 Other Things Scientists Used to Think Were Real)
- Date posted
- 7 months ago
- Description
- To explain how the world works, scientists occasionally have an idea that — upon further testing — turns out to be wrong. From rays that carry coldness instead of heat, to a neighboring star that causes regular mass extinctions on Earth, here are 5 things that some natural philosophers and scientists thought could be real.
Hosted by: Reid Reimers (he/him)
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- Title
- 5 Ways Space Is Actually Good for You
- Date posted
- 7 months ago
- Description
- Space travel is infamously bad for your health. But it turns out that in some very specific cases, space travel may actually be beneficial. Like by strengthening your bones, or repairing your DNA.
Hosted by:@NotesByNiba (she/her)
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- Title
- 4 Fungi We've Finally Figured Out How To Farm
- Date posted
- 8 months ago
- Description
- Mushroom foragers rejoice! Your lives just got a whole lot easier! Now, we can farm four mushrooms that used to only be found in the wild: morels, huitlacoche, chanterelles, and truffles. Here's why it took so long.
Hosted by: Madelyn Leembruggen (she/her)
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- Title
- You Don’t Need A Uterus to Get A Uterine Disease
- Date posted
- 8 months ago
- Description
- Endometriosis is a disease that affects about one in ten women, and comes from tissue inside the uterus making its way out. But it turns out that's not the only way to get it, because there are people without uteruses who have it too. Here's what science has to say about the paradoxical patients who have endometriosis, no uterus required.
Hosted by: Savannah Geary (they/them)
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- Title
- These Birds Aren’t Real
- Date posted
- 8 months ago
- Description
- Visit https://brilliant.org/scishow/ to get started learning STEM for free and get 20% off their annual premium subscription.
If you’ve been around the internet long enough, you’ve probably heard of the “conspiracy” that birds aren’t real (It's not a real conspiracy theory; it was started as a joke). Well for decades, scientists have been using fake birds (even dressing up as birds themselves) to study birds and help conserve endangered species.
Hosted by: Niba @NotesbyNiba (she/her)
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