During the course of your life, you’re likely to breathe in and out more than half a billion times. In this essential activity, air enters into the respiratory system, which extracts oxygen and sends it through the body via the bloodstream.
Explore the parts of the respiratory system, learn about their functions, and then take the quiz.
Imagine a car racing down the road, emitting nothing from its tail pipe but pure water. That car would be powered by a hydrogen fuel cell.
What's more, fuel cells are funny. Or at least they are in this first video. Once you've watched it, check out the other resources (particularly "The Artificial Leaf"), and see how far these amazing devices have come since that video was made.
These storms are disruptions in the magnetic field that surrounds Earth. They're usually caused when some of the sun's material is flung into space, connecting with the magnetosphere.
Geomagnetic storms can create beautiful auroras in the sky and some nasty electrical problems on Earth. Find out how the sun, approximately 92 million miles away, causes these disturbances.
The International Space Station is a symbol of international cooperation — a true reflection of the collaborative nature of science.
Orbiting 250 miles above the Earth, the ISS houses teams of astronauts and scientists. See what's it's like to live and work in microgravity for months at a time.
Can you imagine studying and manipulating matter at the scale of a nanometer — 100,000 times smaller than the thickness of a human hair? That's nanoscience.
Today we think of the cell as a miniature factory with many dedicated molecular machines. Find out how researchers are looking to cells to create science and technology on a tiny, but magnificently powerful, scale.
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