What must our dogs be thinking when they look at us? Poet Billy Collins imagines the inner lives of two very different companions. It’s a charming short talk, perfect for taking a break and dreaming …

Koalas live where it’s often hot and dry. But koalas can’t sweat! So how do they keep cool? Jessi has the answer!

Measuring 'intellect' is a difficult task. Check out one way scientists are attempting to make this endeavor more testable.

Sled dogs are the best endurance athletes in the world thanks to a weird quirk in their metabolism.

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It’s so easy to forgive a dog, especially when they start with those puppy dog eyes. As it turns out, those puppy dog eyes and the effect they have are no accident and the result of centuries of domestication.

Not to deter you from eating your vegetables, but what if we told you that certain parts of your salads, like kale, broccoli, and cauliflower were all the same species?

Did you know that there were over 200 types of cows? Join Jessi and Squeaks as they discuss some cool facts about these amazing animals.

I’t teach an old dog new tricks — but that saying might not be as trustworthy as you’d think.

Dr. Ivan Pavlov's groundbreaking work revealed that a dog will respond to neutral stimuli, such as a bell, in the same way that it will respond to, say, mouth-watering food. This research is widely applicable beyond a dog's salivation....

Cats are known for their curiosity, and as that one saying goes “it killed the cat”. But we can help our cuddly counterparts avoid this sad fate if we watch out for these three everyday things.

Everyone is afraid of something, and traditionally, we’ve thought that fears are learned. But the key to understanding some fears could lie in our DNA.

Hybrid organisms are rare, and most end up sterile, like mules. But sometimes, three or more species come together to create multi-species hybrids, and they can and have been really useful.

Hank gives you five MORE reasons why you should probably avoid smoking, or quit if you already smoke - in addition to those big ones you already know about. These are the weird reasons.

In 1925, 20 teams of sled dogs braved the harsh Alaskan winter to carry a package of diphtheria antitoxin over 1000 km to save a small town from a deadly outbreak!

By analyzing survivorship curves over the centuries, we can learn what’s changed about how - and when - humans die.

You might love your good, sweet pupper, but can you ever truly be sure if they love you back?

It seems like the easiest way to avoid tiny parasites is to just slap on your animal’s tick or flea collar and hike into the woods worry-free. But you definitely shouldn’t.

In order to truly understand differences among animal lifespans, we need to stop thinking about a specific number and start thinking about a distribution.

If you’ve ever been scratching a dog and seen them do the kicky leg thing, it’s truly adorable. But it might not necessarily be a feel-good thing.

Hank explains speciation - the evolutionary process by which new biological species arise - in terms of finches, ligers, mules, and dogs.

Dr. Mark Hebblewhite comes to the SciShow studio to talk to Hank about his research into ungulate herbivores and their predator-prey relationships with a variety of carnivores.

Cats and dogs have it tough: They can't use straws, or tip a cup up to their mouths to drink. Instead, they have to use their tongues and a few different physics tricks to quench their thirst.

Laughter, love, and happiness are some of the best aspects of being human, and we've looked into the science behind it more than a few times. Here are a few videos that we hope will make you happy!

Bright pillars of light... clouds of glowing dust... shimmering discs floating around the sun... signs of extraterrestrial activity, or is there a more rational and scientific explanation for this phenomenon?