Even cells can be selfish.

In this video Paul Andersen explains the important relationships that exist in ecosystems. He starts by delineating between organisms and their environment. He explains how food webs can be used to show energy and matter flow in a...

Corals in the Pacific Ocean have been dying at an alarming rate, particularly from bleaching brought on by increased water temperatures. But it's not too late to act, says TED Fellow Kristen Marhaver. She points to the Caribbean -- given...

We have a lot of water on Earth, but we also can't actually drink much of it... or use it for farming. That's because most of the water on Earth is saltwater. We humans, like a lot of living things, need freshwater to survive. In this...

If you’re trying to figure out where to plan on sheltering during the zombie apocalypse, it’s essential to know whether zombies sink or float!

On a cold day, sometimes people will say "I'm freezing!," even though they aren't actually frozen like ice. But there is a very special animal that can say "I'm freezing" and mean it: wood frogs! Join Jessi and Squeaks to...

Why are humans so slow to react to looming crises, like a forewarned pandemic or a warming planet? It's because we're reluctant to rethink, say organizational psychologist Adam Grant. From a near-disastrous hike on Panama's highest...

Have you ever wondered if there is anyone (or anything) else out there in the universe? Well, you're not alone. But what would alien life look like? And what would their food chains and food webs look like? In this episode of Crash...

This week on SciShow news we have some very unfortunate reports from scientists concerning the Great Barrier Reef. However, scientists have also created a 3-D model of Zika Virus, which is one step towards finding out how it functions.

Life in a desert can be tough, but the plants, animals, and people that live there have some special skills to help them survive!

A caterpillar hatches from an egg, makes a cocoon, and emerges a fully-grown, beautiful butterfly. But, during its time in the cocoon, the caterpillar melts its body into bug goo... then even weirder stuff happens.

Hank gets to the more violent part of community ecology by describing predation and the many ways prey organisms have developed to avoid it.

Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous,...

Sustaining life requires substantial energy and matter inputs. The complex struc- tural organization of organisms accommodates the capture, transformation, trans- port, release, and elimination of the matter and energy needed to sustain...

Tropical rainforests are known for being super biologically diverse _ they're full of different species, from colorful birds and insects to plants and fungi. We haven't even come close to cataloguing everything that's there.

In our continuing series on Earth's weirdest places, Hank describes the crazy place in Antarctica known as Blood Falls in all its scientifically strange majesty.

Why do Bats Transmit So Many Diseases Like Ebola

Jessi and Squeaks discover some amazing ocean creatures, ones that glow by themselves!

Adam Savage makes things and builds experiments, and he uses costumes to add humor, color and clarity to the stories he tells. Tracing his lifelong love of costumes -- from a childhood space helmet made of an ice cream tub to a No-Face...

So... do plants need dirt? The truth might shock you. In this episode of Crash Course kids, Sabrina talks about how plants get energy and how that energy is transported around them. Also, she talks about dirt.

Paul Andersen explains how natural selection is a major mechanism in evolution. The video begins with a discussion of Charles Darwin and the details of natural selection. The data of the peppered moth during the industrial revolution...

In this video Paul Andersen explains how population ecology studies the density, distribution, size, sex ration, and age structure of populations. Intrinsic growth rate and exponential growth calculations are included along with a...

How would a Polar Bear do if you put it in the desert? Not well. But why? Why can't anything live anywhere? Well, this has to do with Habitats and how animals (including humans) are suited for living in one place over another. In this...

Cannibalism may actually make a community healthier, but maybe don't try it at home.