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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.

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.

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

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.

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.

Shaping an airplane a certain way -- or using materials that absorb radar waves -- causes a stealth aircraft to have the signature of a small bird, rather than an airplane.

If you have a friend who runs marathons, you know that he/she has a "low resting heart rate". What this means is that, when your friend is sitting on the couch watching TV, his/her heart beats much more slowly than the heart of a "norm ...