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.

The Supernova of 1054, Our Very Special “Guest Star”

All of humanity likely saw it, a brilliant supernova that lit up the daytime sky in 1054. But 960 years later, there’s still a lot we dont quite understand about the famous celestial phenomenon.

engineeringhistory:

American Institute of Electrical Engineers membership for Nikola Tesla, documenting his elevation to the grade of Fellow, the organization’s highest membership grade.

engineeringhistory:

American Institute of Electrical Engineers membership for Nikola Tesla, documenting his elevation to the grade of Fellow, the organization’s highest membership grade.

Are Blue Eyes Endangered?

SciShow explains the genetics — and physics — behind why blue eyes are blue, and what the future may be for the trait. Spoiler alert: Blue eyes aren’t really blue! SciShow explains!

What Really Killed the Dinosaurs?

What wiped out the dinosaurs? Most of us were taught it was a killer asteroid — which is true. But it turns out there was more than one disaster movie playing at the cineplex that was Earth 66 million years ago.

Why do jet airplanes get better fuel efficiency at high altitudes?

Because there’s less air! OK, so there are two reasons airplanes have to expend fuel. First, to keep themselves off the ground and second to keep themselves moving forward.

Lots of air around helps planes get lift, but planes can generate more lift in other ways…by having larger wings or traveling more quickly, and more quickly is what we want…so let’s just do that! Energy expended to move the plane forward is only limited by the amount of drag on the plane and the only way to reduce that is to make the plane more aerodynamic (which we’ve done pretty much everything we can to achieve) and by making it fly through thinner air. There are far fewer air molecules at 30,000 feet than at sea level, so the plane is literally running into fewer molecules and thus it can travel more efficiently.

Of course, at a certain height, planes have to have such large wings or travel so fast to generate lift that this efficiency gain is no longer productive. The engineers have done the math and found the optimal height for efficient travel and designed planes to operate best at that height. Yay engineers!

-Hank

We’re bad judges, better teachers, and video games are pretty good for us!

Humans judge each other within 33 milliseconds of seeing each other! We learn better if we think we have to teach someone else, and video games are good for us! 

Did you know that we’ve got 100 freshly-signed copies of SciShow: The Apocalypse Collection on DVD?! These DVDs feature 8 SciShow episodes, lots of outtakes, 25 minutes’ worth of interviews with the SciShow crew, and a big ol’ signature by the one and only Hank Green. 

You can pick up your own copy (while supporting SciShow) right now on Subbable!

Comet Chase & Molten Moons

In this episode of SciShow Space News, Hank details the work of the European Space Agency’s Rosetta spacecraft. He also explains the new discoveries of Jupiter’s moon Io.