Last week, an asteroid impact drill was conducted, which demonstrated what might happen if an asteroid hit us within the decade. It didn't go quite as well as we would like.

Violinist Sirena Huang gives a technically brilliant and emotionally nuanced performance. In a charming interlude, the 11-year-old praises the timeless design of her instrument.

Several rovers on Mars's surface are currently in operation, including one you might not have heard of: China’s Zhurong rover. It's already spent over a year on the Martian surface and is bringing us ever closer to understanding the...

Bruce McCall paints a retro-future that never happened -- full of flying cars, polo-playing tanks and the RMS Tyrannic, "The Biggest Thing in All the World." At Serious Play '08, he narrates a brisk and funny slideshow of his...

You can't help it; sometimes, you just get a bad feeling about someone that's hard to shake. So, what's happening in your brain when you make that critical (and often lasting) first judgment? Peter Mende-Siedlecki shares the social...

The deep-sea dragonfish is a predator that lives deep in the Pacific Ocean. Like many other deep sea predators, it's got an oversized jaw and a bioluminescent appendage to attract prey, but it does have one weird (and strangely useful)...

In this video Paul Andersen explains how the gravitational mass is a measure of the force on an object in a gravitational field. The gravitational mass is based on the amount of material in an object and can be measured to a standard kg...

How different would things be if Earth had always rotated in the opposite direction?

In this video Paul Andersen shows conceptual thinking in a mini-lesson on probability and prediction.

T
ERMS:
Cause - a thing that gives rise t
o an event
Ef
fect - an event
Relationship- interconnection betwe
en...

You may have heard that facing your fears is the best way to overcome them, but there’s a little more to it than that.

You might have heard that supposedly, no one who was born blind has ever been diagnosed with schizophrenia. But if that’s true, how those two conditions so closely related to each other?

FEED ME! In this episode of Crash Course Kids, Sabrina has a chat with us about what living things eat to get energy. What makes something an omnivore, or a carnivore, or an herbivore? And how do plants fit in to all of this? This first...

For the past few years, airports have been working with game theorists to step up their security game.

Tech that can decode your brain activity and reveal what you're thinking and feeling is on the horizon, says legal scholar and ethicist Nita Farahany. What will it mean for our already violated sense of privacy? In a cautionary talk,...

Today we're going to discuss how machine learning can be used to group and label information even if those labels don't exist. We'll explore two types of clustering used in Unsupervised Machine Learning: k-means and Hierarchical...

Today we're learning about the Transatlantic Slave Trade, which brought millions of captive Africans to the Americas between the 16th and 19th centuries, with the largest number of people trafficked between 1700 and 1808. We'll look at...

The exploding “cow” around 200 million light-years away is running astronomers for a loop, but if it is what some hypothesize, we are witnessing a first for astronomy! Meanwhile, we got photographic evidence of a planet orbiting a binary...

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...

UPDATE: We got a couple of things wrong when it comes to gravity (particularly that it has nothing to do with photons). Science is working tirelessly night and day to disprove its own theories about how the universe works (or at least,...

The current hurricane category scale doesn’t accurately convey the danger of a storm, because it doesn’t account for a hurricane's most destructive factors.

Welcome to the romantic, violent, treacherous, and murderous mating lives of bugs.

Outside of China, Mandarin and Cantonese are often referred to as Chinese dialects, despite being even more dissimilar than Spanish and Italian. On the other hand, speakers of Danish, Norwegian, and Swedish, which are three distinct...

In which John Green teaches you about various reform movements in the 19th century United States. From Utopian societies to the Second Great Awakening to the Abolition movement, American society was undergoing great changes in the first...

In this video Paul Andersen explains how a spectrometer was used to identify the presence of isotopes. This modified Dalton's original atomic theory because atoms of the same element had different masses. The functional parts of a mass...