Being infected with a parasite is bad, right? So why are wolves in Yellowstone National Park infected with Toxoplasma gondii some of the most successful individuals<br/>

When you think about the impact of climate change on the circle of life, you likely picture polar bears or Bengal tigers struggling in new conditions. But the impacts on the world go all the way down to the tiniest creatures who do some...

The earth is a big place to keep clean. With Litterati -- an app for users to identify, collect and geotag the world's litter -- TED Resident Jeff Kirschner has created a community that's crowdsource-cleaning the planet. After tracking...

Earth's orbit has a bit of a litter problem. Hank outlines a few ways scientists have thought of to help clean things up.

Sometimes, it makes sense for critters across the animal kingdom to chow down on their own young.

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FYI: We try to leave jargon out of...

Nick Jenkins talks with Hank Green about selective breeding, with special guest Jessi Knudsen Castañeda.

Hank talks about the last major way humans are impacting the environment in this penultimate episode of Crash Course Ecology. Pollution takes many forms - from the simplest piece of litter to the more complex endocrine distruptors - and...

Singapore’s legal system is modeled after the British system. Although certain rules may favor indigenous people of the country, most laws and regulations apply to everyone. Similar to the system in Britain, there are several levels of...

Howcast - Find out if pet rabbits can be litter trained in this Howcast video featuring bunny lover Amy Sedaris and rabbit expert Mary E. Cotter.

Howcast - Learn if you should spay or neuter your pet rabbit in this Howcast video featuring bunny lover Amy Sedaris and rabbit expert Mary E. Cotter.

Howcast - Find out what is the best litter material for a pet rabbit in this Howcast video featuring bunny lover Amy Sedaris and rabbit expert Mary E. Cotter.

Howcast - Learn how to get rid of your pet rabbit's odor in this Howcast video featuring bunny lover Amy Sedaris and rabbit expert Mary E. Cotter.

Howcast - Most cats are more comfortable being homebodies than world travelers. If you find it necessary to take your cat on a trip, the following guidelines will point you in the right direction.

Howcast - Sitting your neighbor's cat while they are on vacation can be the purr-fect job if you follow the proper instructions.

Howcast -Find freedom from constantly changing the box with tips to get kitty to do her business outside.

Howcast -Learn about the supplies you need to take care of a cat from board-certified veterinary behaviorist Dr. E'Lise Christensen, DVM in this Howcast video.

Howcast -Learn how to reduce cat odor and cat poop odor from board-certified veterinary behaviorist Dr. E'Lise Christensen, DVM in this Howcast video.

Howcast -Learn why a cat will suddenly stop using its litter box from board-certified veterinary behaviorist Dr. E'Lise Christensen, DVM in this Howcast video.

Howcast -Learn how to litter box train your cat from board-certified veterinary behaviorist Dr. E'Lise Christensen, DVM in this Howcast video.

Howcast - Mother cats often train their kittens to use a litter box, so a new cat may already be housebroken. If not, don't worry—cats are quick studies.

You don't have to live with an oil-stained driveway. Get rid of the mess with these stain-busting techniques.

Get to know this litter of piglets from mom Tulia and dad Legolas, and learn all about this species from Africa.

Get to know this litter of piglets from mom Tulia and dad Legolas, and learn all about this species from Africa.

Get to know this litter of piglets from mom Tulia and dad Legolas, and learn all about this species from Africa.