After his HIV diagnosis, former pro rugby player Gareth Thomas set out on a mission to tackle the stigma and shame that prevent people from getting the testing and care they need. In this empowering talk, Thomas shares his mission to...

Women have been a powerful (and largely underappreciated) force in the movement for Black equality in the United States. The Black Power Movement is no exception to that trend. Today, we'll learn about how women contributed to several...

In this video Paul Andersen shows conceptual thinking in a mini-lesson on stability and change. Two examples are included in the video and two additional examples are included in the linked thinking slides. ...

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...

Self-driving cars have been “coming soon” for years. What’s so hard about making a machine that drives itself!?

We all know that we need things like water and oxygen to live, but what happens when you get too much of a good thing?

Want to learn more about the topic in this week's video? Here are some key words/phrases to get your googling started:

- extreme weather - Conditions and events that occur with low frequency, but which often have significant...

There's a lot we don't understand about autism spectrum disorder, but this week scientists announced that they may have found a link between the disorder and elevated hormone levels.

From sucrose to high fructose corn syrup to... lead? Hank gives us the sweet and lowdown on sweeteners.

Your favorite band is great at playing musicbut not so great at being organized. They keep misplacing their instruments on tour, and it's driving their manager mad. Can you solve the brain-numbing riddle their manager assigns them and...

How do we know how old the Earth is? Learn how we date rocks, the moon, and planets.

What is a Neutrino?

Toxic waste, by definition, is harmful to living things, but there are actually a bunch of plants, animals, fungi, and microbes that can help us clean it up! Chapters OYSTER MUSHROOMS 0:49 SUNFLOWERS 3:06 3 BIVALVES 5:11 BONFIRE MOSS...

Have we been wrong about how big neutron stars are this whole time?

Escaping slavery; risking everything to save her family; leading a military raid; championing the cause of women's suffrage; these are just a handful of the accomplishments of one of America's most courageous heroes. Janell Hobson...

Abusing inhalants, like glue, can cause serious health problems, and you shouldn't need a video on the internet to tell you that. But let's take a deeper look at why these chemicals are so dangerous.

We've all got bad habits that we might feel a little bad about, but we're here to tell you stop feeling guilty! Kind of.

What is the best life we can live? How can we cope with whatever the universe throws at us and keep thriving nonetheless? The ancient Greco-Roman philosophy of Stoicism explains that while we may not always have control over the events...

This week the FDA approves the first ever blood test for diagnosing concussions, and a group of scientists develop a neural network that could save you a trip to the eye doctor.

This is episode 3 of our animated series "Think Like A Coder." This 10-episode narrative follows a girl, Ethic, and her robot companion, Hedge, as they attempt to save the world. The two embark on a quest to collect three artifacts and...

DNA damage doesn't just happen in the summer, but does that really mean we should wear sunscreen in the cloudy and chilly months?

Paul Andersen explains how changes in the genotype of an individual can affect the phenotype. He begins with genotype:phenotype::letters:story analogy. He explains how mutations can be neutral, beneficial or harmful. He also explains...

In this short, optimistic talk from TED2009, Pete Alcorn shares a vision of the world of two centuries from now -- when declining populations and growing opportunity prove Malthus was wrong.

The Golden State Killer was finally caught last week after more than 40 years, but the science behind it wasn’t just your everyday DNA forensics.