The human population of the world will soon peak – and then decrease – thanks to a combination of two quickly changing economic and educational trends.

Nuclear war is a terrifying existential threat, but we shouldn't only fear the blasts because the ensuing smoke is the real killer.

Methuselah’s environment lacks nutrients, water, and oxygen. In other words, it’s the perfect place to grow very very old.

By combining historical demography and epidemiology, we can (sort of) determine how people throughout history have died.

The shape of a farm can tell you a surprising amount about the land it's on and the people that use it.

A simple mis-folding in a certain brain protein causes a disease for which we have no cure.

When it comes to the mating game, fish have some of the strangest ways of thwarting the competition.

We actually have no idea what a “disease” is.

Plants don't make caffeine just for us, so what DO they make it for?

It’s common to call creepy crawlies bugs, but because entomologists refer to a specific class of insects as bugs, it’s wrong to call other things bugs - right?

In 1990, fossil collectors in South Dakota stumbled across a dinosaur that turned out to be a really big deal. Not just because it was a T. rex – basically the most popular dino out there – or because it ended up in Chicago’s famous...

By overcounting how much carbon their forests suck up, and undercounting how much carbon their industries release, countries undercount their total carbon emissions.

Watch these amazing rewilding videos from our friends at Planet Wild, in which they’re saving Europe’s cutest bird from extinction or resurrecting a dying forest.

Trees are a super-efficient way to sequester carbon, but since planting the wrong trees in the wrong place can do more harm than good, we need to go about tree planting more carefully.

Across the southeastern United States, bald eagles have been dying unexplainedly for the past 25 years. In March of 2021, researchers announced that they had found the killer, and they hope we can use this knowledge to better protect...

Some animals live in pretty extreme places, but the lava cricket might be the most hardcore of them all. These crickets have only been observed right after volcanic eruptions, and scientists have questions, like “How does a flightless...

Oxygen is crucial for life as we know it, but before it could build up in our atmosphere, earth had to slow down.

There's a compound found in squid skin that they use to change color and protect their cells, but it could also help us fight some of the most common disease-causing microbes out there.

If a tree falls into the forest and doesn't decompose, what happens to it?

If the 10 kilometer wide asteroid that hit the Earth 66 million years ago hit just a few minutes later, would the outcome of the living creatures here have been different?

Dinosaurs were huge—it's common knowledge. So why aren't modern mammals anywhere near that size? In this episode of SciShow, Hank gives a quick run-down of the reasons scientists think the land mammals of today are nowhere near the size...

Humans are great at creating, and solving, problems. Hank talks with Gina McCarthy about the biggest public health problem we face today: climate change. Gina McCarthy is the Director of C-CHANGE (Center for Climate, Health and the...

Surround a wild animal with humans, and there are bound to be some changes. Here are five animals that show differences in captivity.

If, for some wild reason, we decided that breeding humongous spiders was a good idea, could we actually pull it off?