Episode

BrainStuff

HowStuffWorks

Science & Medicine, Natural Sciences, Society & Culture, Technology

Chart Positions

Natural Sciences 4
Science & Medicine 11

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

How Red Eyes in Photographs Work

July 14th, 2008

Episode 26 of 1068 episodes

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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