What "Probably Causes Cancer" Really Means

One of the most commonly-used pesticides in the world was recently declared a probable cause of cancer—but that doesn't mean what you think, and here are some stick figures to explain it to you. » 4/01/15 6:27pm Yesterday 6:27pm

Watch This CD Rip Apart –  At 170,000 FPS

The Slow Mo Guys filmed a CD spinning up to 23,000 rpm at a genuinely incredible 170,000 frames per second. It's the highest frame rate they've ever employed on the channel, and it's pretty spectacular to watch. (For reference, the footage up top was shot at "only" 28,500 FPS.) » 3/30/15 1:50pm Monday 1:50pm

These Microscopic Videos Show How Our Bodies Are Really Fields Of War

To the naked eye, your body may not look like the site of much action, but take a closer look and you'll see the microscopic battles being waged every moment of every day, between our bodies' invaders and the systems that fight back. » 3/25/15 3:00pm 3/25/15 3:00pm

How To Fly A Spaceship To The ISS: Orbital Mechanics And A Fancy Stick

How do astronauts get from Earth to the International Space Station? Well, in a Soyuz spacecraft, of course. But do you know what kind of path the Soyuz takes to rendezvous with humanity's orbital outpost? It's probably not what you think. » 3/25/15 1:20pm 3/25/15 1:20pm

A Mind-Melting Supercut Of Movie Dream Sequences

Dream sequences are an amazing way of breaking down the walls of reality — even in a supposedly "realistic" film. Film editor Gabriel Adelman has put together a supercut of the most beautiful and disturbing dream sequences from over a century of film, and the results are amazing. » 3/24/15 3:40pm 3/24/15 3:40pm

These Videos Take You Inside The World's Spookiest Underground Cities

You don't have to bring your own flashlight to take a tour of the cities that humans have built underground. Just lean back and let these videos unlock all of their subterranean secrets. » 3/20/15 3:00pm 3/20/15 3:00pm

Stunning Timelapses Show The World's Largest Cities From The Air

The greatest cities on Earth are always in motion. Their bustling activity forms a great collective organism, whose shape changes over time. So there's a good reason why we're all fascinated by timelapses of cities — and there's nothing cooler than timelapses of aerial footage. See the world's biggest cities in a… » 3/19/15 3:05pm 3/19/15 3:05pm

Video Contest: Remix The Avengers: Age Of Ultron Trailer!

The latest trailer for Avengers: Age of Ultron was full of so much greatness, we had to rewatch it a hundred times. But it also has the potential to be so many other things. So we're inviting you to remix the Age of Ultron trailer. Into a romantic comedy. Or a horror movie. Or a mash-up. Go nuts! » 3/16/15 4:00pm 3/16/15 4:00pm

Watch ISS Astronauts Geek Out About Star Trek

The crew aboard the ISS conducted a long interview with radio station WTOP recently, covering everything from daily life aboard the ISS, to their Star Trek childhoods. » 3/16/15 4:06am 3/16/15 4:06am

How To Make Smoke Rings With A Water Bottle, A Balloon, And Incense

In high school, I once tried to build a smoke-ring-generating vortex cannon out of a five-gallon paint bucket, a t-shirt, and some dry ice. My contraption was a letdown. It produced weak, wispy rings, and did so inconsistently. This video shows how to build a DIY vortex cannon that actually works. » 3/11/15 2:00pm 3/11/15 2:00pm

This Time-Lapse Was Made For People Who Think Time-Lapses Are Boring

Do time-lapse videos put you to sleep? This creatively edited footage of Austria's various natural and cultural attractions is something you might actually enjoy. » 3/09/15 4:10pm 3/09/15 4:10pm

Dreamy Video Captures Murmuration Of Starlings Undulating In The Sky

Starling flocks are called "murmurations." The birds fly in massive, tightly-packed groups to fend off predators, find food together, and seek mates. There are several theories as to how they coordinate their flight patterns so smoothly; what's certain is how hypnotic it looks from the ground. » 3/07/15 10:30am 3/07/15 10:30am

Slug Slime Is A Liquid Crystal And It's Actually Pretty Incredible

You do not become a forest-floor-creeping mollusk on good looks alone; to crawl effectively, you need something with which to lubricate your wriggling, slimy, slithering self. Mucus, secreted in abundance from your entire body, is just the ticket. But slug slime is good for a lot more than whole-body lubrication. » 3/03/15 7:00pm 3/03/15 7:00pm

Few Things Are As Captivating As Ink Billowing Through Water In Slow-Mo

The Slow Mo Guys squirted various colors of ink into a big tank of water and shot it on white seamless with a phantom 4K camera. The resulting footage, played back in suuuuuper slllllowwww moooootion, is utterly entrancing. » 3/02/15 4:25pm 3/02/15 4:25pm

Learn Which Famous Authors Coined "Nerd" And "Quark" In This Fun Video

This week's episode of Mental Floss' List Show on YouTube, hosted by John Green, breaks down 43 words invented by authors (spoiler alert: they're not all by Shakespeare ... and a lot of them are from scifi books!) » 3/01/15 9:45am 3/01/15 9:45am

How To Hack Your Street Lamps Like An Astronaut

A bright street lamp can ruin a night of stargazing, saturating your retinas with light and washing out the comparatively faint glow of constellations and meteors. Here's a handy hack you can use the next time you need to put one temporarily (and reversibly) out of business, courtesy of NASA astronaut Don Pettit. » 2/19/15 3:55pm 2/19/15 3:55pm

Why So Many Species Are Discovered In Museum Storage

The latest episode of the American Museum of Natural History's outstanding series "Shelf Life" is about the discovery of the olinguito, a ridiculously adorable species of mammal first identified in 2013 – ninety years after its remains were first collected, in 1923. » 2/18/15 2:40pm 2/18/15 2:40pm

Drinking Can Help Boost Your Immune System, And Other Wellness Fun Facts

Does chicken soup really have healing powers? Does an apple a day really keep the doctor away? And what's so special about garlic, anyway? This short video from AsapSCIENCE breaks down the science behind sick remedies that work (and don't). » 2/07/15 11:08am 2/07/15 11:08am

Snowy Yellowstone Footage Shows Geyser, Buffalo, And Bigfoot?

Because every time there's a new viral Bigfoot video, we can't stop ourselves from watching it, skepticism be damned. This one, at least, contains some lovely views of Yellowstone National Park, where the geysers are majestic and the buffalo roam ... and maybe Sasquatch (keep your eyes on the trees) do, too. » 2/06/15 4:00pm 2/06/15 4:00pm