When people travel a long distance, they'll usually use a map. But there are lots of animals that travel really long distances, too, and they can't use maps... so how do they not get lost? Our friend Dr. Turtleman...

The sun is out and Jessi and Squeaks are ready to perform all kinds of fun outdoor science experiments! Let's take a look at some of the fun activities they've done before, like making a kite, building a solar tower, blowing bubbles, and...

The English Theater survived a lot of pushback from various powers that be, but in the 17th century, it had to go into hiding, from PURITANS. Let's take a look at how the English Civil War, Charles I's beheading, and the Restoration of...

How do fingerprints form? Even though many people think it's random, a lot of it has to do with your genes!

Paul Andersen explains how genes are regulated in both prokaryotes and eukaryotes. He begins with a description of the lac and trp operon and how they are used by bacteria in both positive and negative response. He also explains the...

If you can't imagine life without chocolate, you're lucky you weren't born before the 16th century. Until then, chocolate only existed as a bitter, foamy drink in Mesoamerica. So how did we get from a bitter beverage to the chocolate...

Have you ever noticed how easy it is to get distracted while studying - even when you know you really don't have time for Facebook, Snapchat, Cookie Clicker, or whatever else is calling you? This week we're going to help you get a better...

You're on YouTube right now, but you should probably be studying or writing that research paper. But as long as you're here, we're going to help you figure out how to get the better of your desire to procrastinate in the future. Just...

We’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than...

Squeaks built Jessi a snowman! But, now Jessi and Squeaks need to save it from melting!

Today Phil explores the world of tides! What is the relationship between tides and gravity? How do planets and their moons become tidally locked? What would happen if you were 300km tall? Important questions.

Usually when it's snowing outside, it's really calm, pretty, and fun to play in! But there are certain types of big snowstorms, called blizzards, that can get really windy, wild, and even dangerous!

Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller groups and larger clusters. Our Milky Way is part of the Local...

The Milky Way is our neighborhood in the universe. It’s a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more. They come in four main shapes: elliptical, spiral, peculiar, and irregular....

In which John Green teaches you about the Progressive Era in the United States. In the late 19th and early 20th century in America, there was a sense that things could be improved upon. A sense that reforms should be enacted. A...

In 2007, Paul Rothemund gave TED a short summary of his specialty, DNA folding. Now he lays out in clear, abundant detail the immense promise of this field -- to create tiny machines that assemble themselves.