1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? Alex Gendler reveals the answer and explains how beyond just being a neat puzzle, this type of sequence has practical...

In 1967, researchers gathered to answer a long-running scientific question: just how long is a second? It might seem obvious at first. A second is the tick of a clock, the swing of a pendulum, the time it takes to count to one. But how...

With scientists’ efforts and their creativity, we finally found “the real philosopher’s stone.” That's right, we can now turn lead into gold... a little bit.

How do we know what matter is made of? The quest for the atom has been a long one, beginning 2,400 years ago with the work of a Greek philosopher and later continued by a Quaker and a few Nobel Prize-winning scientists. Theresa Doud...

Scientists have known the outside of the sun spins slower than the inside for a while, but they didn't know why until recently.

Aristotle. He knows a lot, right? And if you choose to believe Aristotle, then you must believe all the mechanics of tragedy that Mike is about to lay on you. This week, we're looking at Aristotle's rules for the basic elements of...

Paul Andersen defines the major elements of feedback loops. The receptors and effectors both sense and respond to changes in their environment. The following examples are used to illustrate the importance of feedback loops in maintaining...

Chemists need stoichiometry to make the scale of chemistry more understandable - Hank is here to explain why, and to teach us how to use it. Table of Contents Atomic Mass Units 2:24 Moles 5:12 Molar Mass 5:59 Equation Balancing 8:45...

Have you ever thought about all the different kinds of groups you’re a part of? Like, there’s the friends you hang out with and your family, your hockey team, your Crash Course fan club, and that’s just for starters! And even though...

Przybylski’s Star has been puzzling astronomers for decades, and it might contain elements or isotopes that scientists have never seen before!

Did you know you have functioning neurons in your intestines -- about a hundred million of them? Food scientist Heribert Watzke tells us about the "hidden brain" in our gut and the surprising things it makes us feel.

Ever wonder what all those names on the periodic table actually mean? There's a whole lot of fascinating history on Mendeleev's table. Some carry names from antiquity, some are named for people, some are named for places, and some are...

Today we’ll explore more about two of the three main types of materials that we use as engineers: metals and ceramics. We’ll discuss properties of metals, alloys, ceramics, clay, cement, and glass-ceramic materials. We’ll also look at...

The days of oil may be numbered, but there's another natural resource that's never been touched, Asteroids.

Asteroid mining sounds like something out of a bad space movie, but harvesting materials from space rocks might be our ticket to building space colonies or living on Mars.

Hank tells us about the awesomeness of the periodic table and the genius of the man who invented it.

Phones, TVs, solar panels, and electric car batteries are all made of some rare and unusual elements. As our modern world creates more and more of these technologies, will things go from "rare" to "nonexistent" and what will we do then?

The elements had been listed and carefully arranged before Dmitri Mendeleev. They had even been organized by similar properties before. So why is Mendeelev's periodic table the one that has endured? Lou Serico explains via Ekaaluminium,...

Voyager 1 may be out of our solar system (and 40+ years old) but we're still getting plenty of new data from our interstellar space probe.

Water covers over 70% of the Earth, cycling from the oceans and rivers to the clouds and back again. It even makes up about 60% of our bodies. But in the rest of the solar system, liquid water is almost impossible to find. So how did our...

Recently, humanity filled the periodic table up to atomic number 118, which nicely rounds out that row. But are we done yet? Have we discovered all of the different elements? And what is an "island of stability?"

Ever wonder how lightning works? Scientists are still figuring it out, but what we do know is fascinating. Learn about positive and negative lightning, red sprites, blue jets, and ball lightning in this episode of SciShow!

Hank reveals why our love affair with the rare earth elements has a dark side.

Continuing our look at Nuclear Chemistry, Hank takes this episode to talk about Fusion and Fission. What they mean, how they work, their positives, negatives, and dangers. Plus, E=mc2, Mass Defect, and Applications of Fission and Fusion...