BrainStuff

Although most people are frightened by radiation, the truth is we are irradiated every day, both from cosmic rays in the sky, and radioactive elements in the ground. Learn more about radiation in this HowStuffWorks podcast.

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Carats are used for diamonds, while karats are used for gold. Learn more about the difference between carats and karats in this HowStuffWorks podcast.

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Is there any way that people could know the world is sphere while standing on the earth? Learn more about perceiving earth as a sphere in this HowStuffWorks podcast.

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Learn about the causes of gas (flatulence) in this podcast from Marshall Brain.

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A normal calendar years is 365 days long, but the earth actually takes 365.2422 days to completely orbit the sun. Learn more about leap years in this HowStuffWorks podcast.

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The flash of a camera is bright enough to cause a reflection off the human retina -- the red we see in these photos comes from the blood vessels in the eye. Learn more about red eyes and cameras in this HowStuffWorks podcast.

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Although the speed of computers is growing exponentially, the human brain may handle roughly ten quadrillion instructions per second. Learn more about the world's fastest computer in this HowStuffWorks podcast.

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A vitamin is a small molecule the body needs but cannot manufacture on its own. Learn more about vitamins in this HowStuffWorks podcast.

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A company named Nanosolar is shaking up the alternative energy industry by offering solar technology at the lowest prices in history -- even cheaper than energy derived from coal. Learn more about Nanosolar in this HowStuffWorks podcast.

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A standard HD screen has roughly 2 million pixels per frame -- but an ultra HD has four times that resolution. Learn more about ultra hi-definition in this HowStuffWorks podcast.

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