Oceanographer Penny Chisholm introduces us to an amazing little being: Prochlorococcus, the most abundant photosynthetic species on the planet. A marine microbe that has existed for millions of years, Prochlorococcus wasn't discovered...

The COVID-19 pandemic hasn’t just affected us. It’s also affected the weather. And this turns out to be a lucky natural experiment to help us understand how much we influence the world around us.

Tropical storms can be devastating but at least we usually know where they're going to appear. The exception being a very strange week in 1996, on Lake Huron.

The source of earth's water is something of a mystery, and some scientists are starting to think that the sun might have provided the special ingredients to help.

In this bracing talk, coral reef ecologist Jeremy Jackson lays out the shocking state of the ocean today: overfished, overheated, polluted, with indicators that things will get much worse. Astonishing photos and stats make the case.

What if we told you that there was a time when oxygen almost wiped out all life on Earth? 3 billion years ago, when the world was a place you'd never recognize, too much of a good thing almost ruined everything for everybody.

Find out how parrotfish, zooxanthellae, calcium carbonate (aragonite), and poop combine to make the white sandy beach sunbathers love.

The Atlantic Ocean is the second largest on Earth, and yet there are no sea snake populations to be found there. What’s keeping aquatic serpents from making a home in these waters?

Hank loves science because it helps us appreciate the world more, but not everything that science does makes him happy - reports of poison fog on the West coast of the United States; dramatic decreases in sperm counts; and a lack of...

Hank shares losses and finds this week, including a huge amount of Antarctic ice that’s lost for good, and 10 cool new species that are last year’s top finds.

We try to leave jargon out of our videos, but if you want to learn more about this topic, here are some handy keywords to get your googling started: - Milky Way: Earth's home galaxy - The Malaspina Expedition 2010: A research project to...

What gives the ocean its distinct, sometimes pungent smell? It turns out the answer is more than just dead fish or salt: it’s the scent of tons of phytoplankton being munched on!

After stalking a cuttlefish, a moray eel finally pounces. As the eel snags the mollusk in its teeth, its prey struggles to escape. But before it can wiggle away, a second set of teeth lunge from the eel's throat. This adaptation is...

3 Ways to Prevent Hurricanes (Maybe)

Have you ever noticed that warning about raw or undercooked seafood at the bottom of restaurant menus? Ever wondered why it's there? Because fish carry a ton of parasites, and if they aren't prepared correctly then those parasites can...

Though we probably won’t find a literal Atlantis beneath the sea, that doesn’t mean that a human settlement hasn’t ever been lost to the water. Meet Doggerland.

Climate action can be a vehicle to deliver dignity, opportunity and equality for all. UN Deputy Secretary-General Amina J. Mohammed invites us to reimagine what the journey to net-zero could look like if we invest in people's climate...

It’s Valentine’s Day, and Jessi and Squeaks got Valentines from their awesome animal friends all over the world! Hang out with them as they read some silly Valentine poems and learn about the animals that sent them!

Nearly all life on Earth is ultimately powered by light. But many creatures have learned how to make their own. This week we investigate the beautiful phenomenon of bioluminescence. From blinking fireflies on summer nights to glowing...

Ever wonder what it'd be like to have a whale as a house? Wonder no more after you watch this episode of SciShow!

A world only 2°C warmer, or 3.6°F, would be one that is much different than the world we live in today, but what does that actually look like?

Some of the largest creatures that have ever lived on earth thrive by eating tiny prey. Why don’t they eat bigger fish, and how can they even consume these things they can barely see? Here are 5 creatures that grow to be giants by eating...

Whales have a surprising and important job, says marine biologist Asha de Vos: these massive creatures are ecosystem engineers, keeping the oceans healthy and stable by ... well, by pooping, for a start. Learn from de Vos, a TED Fellow,...

From spooky-looking towers that belch white "smoke" to a mountain range in the middle of the Atlantic ocean, the seafloor is full of features as dynamic as the surface! That's part of why we've done many SciShow episodes about the ocean....