How do you think about a non-square matrix as a transformation?

Our body is supposed to be paralyzed during REM sleep, but REM sleep behavior disorder might not allow you to stay in bed. It could even cause you to act out your dreams in real life.

Real World Telekinesis (feat. Neil Turok)

We're living in a golden era of innovation, says entrepreneur Ashwini Anburajan -- but venture capital hasn't evolved to keep up, and startups aren't getting the funding they need to grow. In this quick talk, she shares the story of how...

Public health activities are all the ways society coordinates to deliver better health to people. That may sound super broad, and it is, so in this episode of Crash Course Outbreak Science, we'll take a look at public health works to...

Townspeople are demanding that a corrupt merchant's collection of 30 rubies be confiscated to reimburse the victims of his schemes. The king announces that the fine will be determined through a game of wits between the merchant and the...

From calories to sleep, there always seems to be something we're not doing right. Luckily scientists have looked into this and come up with some helpful advice to keep us happy and healthy.

This video explains how Shor’s Algorithm factors the pseudoprime number 314191 into its prime factors using a quantum computer. The quantum computation relies on the number-theoretic analysis of the factoring problem via modular...

An overview of what a neural network is, introduced in the context of recognizing hand-written digits.

How a famous theorem in topology, the Borsuk-Ulam theorem, can be used to solve a counting puzzle that seems completely distinct from topology.

If men can't nurse, then why do they have nipples? The answer has less to do with evolution and more to do with your personal development as a teeny tiny embryo. Short version: We're all girls -- at least at first. Hank explains!

How does bitcoin work? What is a "block chain"? What problem is this system trying to solve, and how does it use the tools of cryptography to do so?

From rockets to stock markets, many of humanity's most thrilling creations are powered by math. So why do kids lose interest in it? Conrad Wolfram says the part of math we teach -- calculation by hand -- isn't just tedious, it's mostly...

Infinities come in different sizes. There's a whole tower of progressively larger "sizes of infinity". So what's the right way to describe the size of the whole tower?

One potential avenue for cancer treatment uses electricity not from any outside machine, but from within our own bodies.

Can you turn your pants inside out without taking your feet off the ground?

In the card game SET, what is the maximum number of cards you can deal that might not contain a SET?

Today, in our final lab, Jabril tries to make an AI to settle the question once and for all, "Will a cat or a dog make us happier?" But in building this AI, Jabril will accidentally incorporate the very bias he was trying to avoid. So...

As we mentioned last episode, one of the best test spaces for building new AI systems are games. This is because games provide a great framework for an AI to learn an objective and slowly improve. In recent years, AI has made huge...

How do you defeat a creature that grows two heads for every one head you chop off? You do the math.

At one time, Wolverine served on four different superhero teams. How did he do it? He may have used graph coloring.

How does bitcoin work? What is a "block chain"? What problem is this system trying to solve, and how does it use the tools of cryptography to do so?

Hank brings you the SciShow news of the week. Recent record high temperatures and other extreme weather events around the world are climate change in action; a new fossil of an ancient human ancestor; some disturbing discoveries about...

The United States can create a more humane immigration system; in fact, it's been done before, says policy analyst David J. Bier. Pointing to the historical success of the US guest worker program, which allows foreign workers to legally...