The HMS Challenger embarked in the 1870s to survey the world’s oceans. The data the expedition collected is still being used over 100 years later to inform what we know about climate change.

When you think about coral reefs, you probably imagine a sparkling tropical oasis that you can easily see while snorkeling or diving, but reefs can be found as deep as 8000 meters! As deep as they are, those reefs are still not immune to...

It seems obvious that animals need oxygen to live, but deep in the Mediterranean Sea there is a very small animal that might be doing just fine without any oxygen at all.

Singer-songwriter Dawn Landes tells the story of Tori Murden McClure, who dreamed of rowing across the Atlantic in a small boat -- but whose dream was almost capsized by waves the size of a seven-story building. Through video, story and...

Oceanographer Paul Snelgrove shares the results of a ten-year project with one goal: to take a census of all the life in the oceans. He shares amazing photos of some of the surprising finds of the Census of Marine Life.

The constant motion of our oceans represents a vast and complicated system involving many different drivers. Sasha Wright explains the physics behind one of those drivers -- the concentration gradient -- and illustrates how our oceans...

The deep-sea dragonfish is a predator that lives deep in the Pacific Ocean. Like many other deep sea predators, it's got an oversized jaw and a bioluminescent appendage to attract prey, but it does have one weird (and strangely useful)...

How different would things be if Earth had always rotated in the opposite direction?

Join Squeaks and his favorite band, The Whizpops, for a musical experience with Manta Rays!

About 66 million years ago, a terrible extinction event wiped out the dinosaurs. But it wasn't the only event of this kind -- extinctions of various severity have occurred throughout the Earth's history -- and are still happening all...

In a few special places around the world, the ocean lights up at night with countless tiny blue flashes thanks to some tiny organisms and science.

Scientists overwhelmingly agree that our climate is changing, Earth is getting warmer, sea levels are rising, and it's primarily because of humans putting lots of carbon dioxide in the atmosphere. Whether you already trust in the...

Did you know that last year we had 28 of the fastest days ever recorded? Earth's rotation can be affected by a number of things, and scientists think we might someday need an unprecedented adjustment: deleting a second!

Dolphins are one of the smartest animal species on Earth. In fact, their encephalization quotient (their brain size compared to the average for their body size) is second only to humans. But exactly how smart are they? Lori Marino...

The best evidence we have suggests that, while Caviomorpha originated in South America, they came from ancestors in Africa, over 40 million years ago. So how did they get there?

Plants need light to survive. But apparently, that doesn't have to be sunlight.

Octopuses have tons of strange and amazing adaptations that help them live their best lives underwater. And those incredible traits could help us in many ways. Chapters View all 1 SUPER-STRONG SUCTION 1:29 2 HOW TO BUILD ADAPTABLE ROBOTS...

You probably already knew that plastic can be bad, but scientists have taken a closer look, and found out it can be bad in surprising ways.

After more than two decades buzzing around above our heads, the life of the ISS will soon be coming to a close. But what does that actually look like? And what does it mean for the future of space experimentation?

In the Pacific Ocean, there lives a fish that's . . . a little different. Hank tells you all about the Pacific barreleye fish!

Dive into the science of ocean currents (including the Global Conveyor Belt current), and find out how climate change affects them. -- In 1992, a cargo ship carrying bath toys got caught in a storm. Shipping containers washed overboard,...

When is an organism not an organism? Or, when is it a bunch of different organisms living together? SciShow introduces you to the weird world of siphonophores.

Want to learn more about the topic in this week's video? Here are some key words/phrases to get your googling started: - extreme weather - Conditions and events that occur with low frequency, but which often have significant impact on...

Earth's ocean water is continuous. How can we divide it into sections that are more useful?