Today we’re going to talk about measures of central tendency - those are the numbers that tend to hang out in the middle of our data: the mean, the median, and mode. All of these numbers can be called “averages” and they’re the numbers...

Recent events have highlighted, underlined and bolded the fact that the United States is performing blanket surveillance on any foreigner whose data passes through an American entity -- whether they are suspected of wrongdoing or not....

New Horizons went into safe mode and lost a few days of science observations. And there seems to be some confusion over whether there are aliens on Comet 67P.

Last week, it was announced that we've detected gravitational waves on Earth. Now, Hank explains what that means for the future and why it's such a huge deal.

By analyzing survivorship curves over the centuries, we can learn what’s changed about how - and when - humans die.

Today, we're going to combine the artificial neuron we created last week into an artificial neural network. Artificial neural networks are better than other methods for more complicated tasks like image recognition, and the key to their...

This week we are wrapping up our overview of sociology’s core frameworks and founding theorists with a look Max Weber and his understanding of the modern world. We’ll explore rationalization and the transition from traditional to modern...

The smartphone you use reflects more than just personal taste ... it could determine how closely you can be tracked, too. Privacy expert and TED Fellow Christopher Soghoian details a glaring difference between the encryption used on...

Oxygen is pretty dang amazing! Some of the most intensely studied functional groups in organic chemistry have oxygen atoms. In this episode of Crash Course Organic Chemistry, we're building on the last episode's discussion of...

"Remember before the internet?" asks Joi Ito. "Remember when people used to try to predict the future?" In this engaging talk, the head of the MIT Media Lab skips the future predictions and instead shares a new approach to creating in...

A technology to ignore birds on radar ended up being useful to study and conserve them.

In the event of a nuclear fallout, every piece of digital and written information could all be lost. Luckily, there is a way that all of human history could be recorded and safely stored beyond the civilization's end. And the key...

Want to do more than talk to your refrigerator and control your lights with your phone? Hank explains how close we are to the smart home that can do everything for us.

Scientists just discovered the largest explosion ever detected, and it's thanks to the collaborative efforts of scientists from all over the world.

Thousands of years ago, ancient Nubians drew pictures on tomb walls of a terrible disease that turns the eyelids inside out and causes blindness. This disease, trachoma, is still a scourge in many parts of the world today -- but it's...

Have you had your period at the same time as your friends or family members? Is this a physiological effect or coincidence? Join Hank Green as he provides some insight on this phenomenon!

Alkenes are an important type of molecule in organic chemistry that we’re going to see a lot more of in this series. But before we can really get into the many cool reactions alkenes do, we need to go over some of the basics. In this...

Spicy food is delicious, but how does it affect our health?

The only way we're going to make substantial progress on the challenging problems of our time is for business to drive the solutions, says social impact strategist Wendy Woods. In a data-packed talk, Woods shares a fresh way to assess...

If you saw our recent episode on Minecraft EDU, then you'll be interested in Mike's talk with it's creator, Joel Levin!

How do babies learn so much from so little so quickly? In a fun, experiment-filled talk, cognitive scientist Laura Schulz shows how our young ones make decisions with a surprisingly strong sense of logic, well before they can talk.

Today we’re going to talk about on how we organize the data we use on our devices. You might remember last episode we walked through some sorting algorithms, but skipped over how the information actually got there in the first place! And...

Today we are exploring the world of formal organizations. We’ll go back to the historical process of rationalization and its impact on organizations in the form of bureaucracy and then discuss how organizations change in response to...

Want to help map the world? Community builder Rebecca Firth explains how the Humanitarian OpenStreetMap Team (HOT) is using open-source software powered by volunteers to put one billion people on the map in the next five years. (This...