Happy pi day! Did you know that in some of his notes, Euler used the symbol pi to represent 6.28..., before the more familiar 3.14... took off as a standard?

Author Jennifer 8. Lee explains how the chopstick spread from the East to the West -- and was designed to give you the perfect bite.

Explore how to use a light microscope with the Amoeba Sisters! Includes microscope parts, how to use, and some helpful tips! Additionally, this video introduces a few types of light microscopes as well as electron microscopes. Expand...

A 2016 survey of freelancers in six countries found that those who freelance by choice– 70% of respondents– were happier than people in traditional jobs, specifically when it came to things like independence and flexibility in terms of...

We live in an age of protest. On campuses, in public squares, on streets and social media, protestors around the world are challenging the status quo. But while protest is often necessary, is it sufficient? Eric Liu outlines three...

Math is logical, functional and just ... awesome. Mathemagician Arthur Benjamin explores hidden properties of that weird and wonderful set of numbers, the Fibonacci series. (And reminds you that mathematics can be inspiring, too!)

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different types...

An overview of backpropagation, the algorithm behind how neural networks learn.

This week Craig Benzine breaks down the different types of bureaucracies. I mean sure, they’re all part of the executive branch, but some work more directly with the president than others. Some bureaucracies exist solely to independently...

Dihydrogen monoxide (better know as water) is the key to nearly everything. It falls from the sky, makes up 60% of our bodies, and just about every chemical process related to life takes place with it or in it. Without it, none...

This week we’re taking our discussion of stratification global. We’ll look at First and Third World countries and the reasons why these terms are no longer used. We’ll introduce the four types of country categories we now use: high...

You know the Golden Ratio, but what is the Silver Ratio?

An overview of backpropagation, the algorithm behind how neural networks learn.

Hank revisits his passion for exploring the Red Planet, breaking down the two biggest challenges of sending humans to Mars: radiation and propulsion. He explains the science behind the obstacles future Mars-bound astronauts...

One hundred sixty years after the invention of the needle and syringe, we're still using them to deliver vaccines; it's time to evolve. Biomedical engineer Mark Kendall demos the Nanopatch, a one-centimeter-by-one-centimeter square...

Paul Andersen reviews the concepts discovered by Gregor Mendel.

Today Shini explains the law of conservation, beginning with simple, steady-state systems. We’ll discuss conversion and yield, accumulation, and how generation and consumption can affect how much accumulation there is in a system.

Social psychologist Thomas Curran explores how the pressure to be perfect -- in our social media feeds, in school, at work -- is driving a rise in mental illness, especially among young people. Learn more about the causes of this...

When you think of matrices as transforming space, rather than as grids of numbers, so much of linear algebra starts to make sense.

In this short, image-packed talk, Marisa Fick-Jordan talks about how a village of traditional Zulu wire weavers built a worldwide market for their dazzling work.

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different...

A short explanation of why Bayes' theorem is true, together with discussion on a common misconception in probability

On today’s episode...CATS. Also: Hank talks about some philosophy stuff, like a few of the key concepts philosophers use when discussing belief and knowledge, such as what defines an assertion and a proposition, and that belief is a kind...

Historians love to debate each other. So some of them pointed out that the first half of this revolution looks a lot different from the second. Let's chat about industry, cars, and Henry Ford.