Can humans really feel temperature?

Paul Andersen details the first 7 of 13 labs in the AP Biology Curriculum. The following topics are all covered: Artificial Selection, Hardy-Weinberg Equilibrium, Comparing DNA using BLAST, Diffusion and Osmosis, Photosynthesis,...

Can Humans Really Feel Temperature

If you want to be prepared for a nuclear attack, here’s a science-based guide to help you get there.

If you've ever put your feet up on a warm summer's day and played "spot the shape in the cloud," you might've seen a kangaroo, a guy preparing to facepalm, maybe a mushroom... On second thought, hopefully not that last one.

We knew some stars created large amounts of calcium, but no one really ever knew how...until now! Plus, astrophysicists believe they’ve finally seen evidence of the star that created one of the most important supernovas ever!

The face of nuclear terror has changed since the Cold War, but disaster-medicine expert Irwin Redlener reminds us the threat is still real. He looks at some of history's farcical countermeasures and offers practical advice on how to...

Can Humans Really Feel Temperature?

Nuclear weapons represent the darker side of E=mc^2. Science has given us the ability to understand what will happen if these weapons are ever used again.... and what will happen if they are *never* used again.

Ragnarok: The fabled end of the world, when giants, monsters, and Norse gods battle for the future. The gods were winning until the great serpent Jörmungandr emerged. It swallowed Valhalla and contorted itself across the land. Odin has...

Paul Andersen shows you how to compare DNA sequences to understand evolutionary relationships. He starts with a brief introduction to cladograms and evolutionary relationships. He shows you how to classify DNA relationships using a...

Nuclear weapons are some of the most powerful tools of destruction on Earth, and the full scope of a nuclear detonation is almost unimaginable. However, there is a scientifically supported plan of action that could save thousands of...

In this podcast Paul Andersen explains how cells differentiate to become tissue specific. He also explains the role of transcription factors in gene regulation. The location of a cell within the blastula ultimately determines its fate....

Some of the greatest advances in science have come from humanity's more destructive impulses. This is not the fault of science - when we discover powerful truths about the universe it's up to us to decide how to use them because...

Paul Andersen describes genetic drift as a mechanism for evolutionary change. A population genetics simulator is used to show the importance of large population size in neutralizing random change. The near extinction of the northern...

On today's episode of Crash Course Anatomy & Physiology, Hank continues our exploration of tissues, with an introduction to your connective tissues.
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The earliest recorded tattoo was found on a Peruvian mummy in 6,000 BC. That's some old ink! And considering humans lose roughly 40,000 skin cells per hour, how do these markings last? Claudia Aguirre details the different methods,...

New ReviewGood ol' corn starch to the rescue!

Howcast - Check out this inFamous 2 walkthrough and beat "Stories of the Past" with this online demo.

Howcast - Check out this inFamous 2 walkthrough and beat "Powering Up Ascension Parish" with this online demo.

Howcast - Check out this inFamous 2 walkthrough and beat "Lost and Found" with this online demo.

Howcast - Check out this inFamous 2 walkthrough and beat "Burning Wells" with this online demo.

Howcast - Learn how to make Minecraft TNT with this gameplay tutorial.

Howcast - Check out part 21 and join the war between the Autobots and Decepticons in Activisions' newest release, Transformers: Fall of Cybertron