Astronaut Weightlessness Training

SciShow Space takes you behind the scenes of astronaut training, to show how crew members and their equipment are tested in microgravity, all while never having to leave Earth.

Does Alcohol Kill Brain Cells?

Quick Questions explains what alcohol does — and doesn’t do — to your brain cells. Enjoy this episode responsibly!

Julia’s writing the latest batch of names on the SciShow Wall of Fame! YOU could be immortalized on our office walls forever for just a $10 contribution on Subbable.

What Causes Morning Sickness?

If you’ve ever been pregnant, or been around a pregnant lady, you know that the agony that is morning sickness — and it’s not just something that happens in the morning! SciShow explains the many theories about what causes it.

Dear sci show why heavy metals (Led, Mercury) are harmful to humans while lighter ones like iron and magnesium are beneficial?

"Heavy metals" is more of a colloquial term than a scientific one. There are lots of very heavy metals that aren’t dangerous at all. We wear gold and silver and platinum in our jewelry. Bismuth is all up in your PeptoBismol and most of the lanthanides and actinides are safe. Also, lots of the lighter metals (particularly sodium and lithium) while being great in certain chemical forms, in their pure forms will kill you extremely quickly (and violently.)

What it comes down to is simply whether the metal interferes with the normal functioning of your body. And we’ve got complicated bodily chemistries so it turns out that there are around a dozen metals that you don’t want to get in your body. At the same time, some of them, like zinc, are helpful it certain chemical configurations. A great example of how it’s not about the metal so much as the chemistry of the body…copper is safe for humans, but is extremely toxic to fish.

-Hank

The First Robot Swarm, and Evolution’s Misfit

Hank shares the nuts-and-bolts of the world’s first robot swarm, and explains what the creepy, cute and extinct animal known as Hallucigenia can teach us about evolution.

Stardust Discovery, and 2 Planetary Conjunctions

SciShow Space shares the latest developments from around the universe, including news about the first material ever collected from outside the solar system, and a backyard astronomers’ guide to two upcoming planetary conjunctions.

Quiz Show with Caitlin Hofmeister

Welcome back to Scishow Quizshow! In this episode Hank Green and Caitlin Hofmeister go head to head to compete for subbable subscribers.

Check out this adorably fantastic thankstank art that was sent in by SciShow viewers Tori and Mallory! It features the names of the fishy inhabitants of our office tank, as well as a corndog-lured anglerfish, Mount McDoobly-Doo the rock, and Papa the tree. Thanks, you two!

Check out this adorably fantastic thankstank art that was sent in by SciShow viewers Tori and Mallory! It features the names of the fishy inhabitants of our office tank, as well as a corndog-lured anglerfish, Mount McDoobly-Doo the rock, and Papa the tree. Thanks, you two!

Why Do Dogs Eat Grass?

Why do dogs eat grass? A look at your pup’s wild relatives may give you a sense of what dogs’ diets are really like.