Where rivers meet the ocean, coastlines tend to bend either inward or outward, creating estuaries and deltas. But how do they get those shapes? Want to learn more about the topic in this week's video? Here are some keywords/phrases to...

All animals have adaptations that help them survive in the wild...some just focus more on back-end development than others. Whether for offense, defense, or both, here are five creatures with butt-kicking behinds!

Sharks have been celebrated as powerful gods by some native cultures. And today, sharks are recognized as apex predators of the world's ocean. What is it that makes these fish worthy of our ancient legends and so successful in the seas?...

For decades scientists believed that monkeys could not speak human language due to an anatomical difference in vocal tracts. Today, we're not so sure that this is the limiting factor after all.

For most of us, the term "puke your guts out" isn't meant to taken literally. But for these animals, it's kind of useful.

Snakes don’t have lips, they can't lap up water, and they don’t grab mouthfuls of water and tip their heads back to swallow, so how do they drink? Turns out, some snakes have sponge-mouths that literally soak up water!

From peeing out of their mouths to being capable of living in icy water, turtles have evolved remarkable, but a little bit bizarre traits to survive.

Some fish will never win any beauty pageants, but they still deserve our admiration, respect, and love, especially since their “ugly” traits are actually incredible examples of evolutionary innovation.

There’s lots of debate as to which original starter Pokémon is the best fighter among squirtle, bulbasaur, charmander, and pikachu, but only one is the most biologically plausible.

Scientists have found 80,000-year-old modern human teeth in a Chinese cave, challenging the most widely accepted timelines of human migration. And electric eels use electricity to both attack and track their prey!

Not all animals have a mouth, or even need one to eat! These different feeding strategies can teach us a lot about our ancestors and how they went from not needing a mouth at all to only eating with one.

Why does your mouth hang open and cause you to make a silly face when you use eye drops or put on mascara?

What's as big as a polar bear, swallows its prey whole, and swims at forty miles an hour? It's not a shark or a killer whale... it's the Atlantic bluefin tuna— the largest and longest-lived of the 15 tuna species. Its unique set of...

Mmmm! The smell of a batch of cookies straight out of the oven is enough to make your mouth water! But have you ever wondered why your mouth waters?! Jessi and Squeaks are here to tell you all about saliva and the many ways it helps you...

It’s become a common belief worldwide that gulping down a glass of milk will make you phlegmy. But... there seems to be no real scientific evidence to back up that claim.

Being happy makes you smile, but that might just work the other way around, too.

When a team of archeologists recently came across some 15,000-year-old human remains, they made an interesting discovery: the teeth of those ancient humans were riddled with holes. So what causes cavities, and how can we avoid them? Mel...

You may have to open your mouth pretty wide to take a bite of a burger, but a Hydra can tear open its mouth to devour food larger than itself.

Frogs are really cool! They can jump high, swim fast, and their skin is super slimy! But frogs have some less-slimy, less-hoppy relatives that are just as cool: toads! Join Jessi and squeaks to learn the big and little differences...

Welcome back to Bizarre Beasts: Season Zero. We are remastering episodes of Bizarre Beasts that were originally created for Vlogbrothers.

The Japanese aren’t usually avid joke tellers, but put them in a group, and they’ll sometimes do humorous imitations of friends and colleagues. Such imitations aren’t considered rude; indeed, they’re often performed in front of the...

What even is sex? In this episode of Crash Course Sex Ed, we’ll discover that variation is the name of the game when it comes to sexuality. People differ in how they have sex, why they have sex, and how they define what sex means.

Howcast - Learn the insider tricks to making balloon animals from magician Jonas Cain in this Howcast video.

Howcast - Learn how your infant should be developing from month twelve through month fifteen from pediatrician Dyan Hes, M.D. in this Howcast video.