The eye, with its incredibly sensitive color vision, is increasingly being recognized as a marvel as we learn more about how it works. The eye is able to detect the smallest measure of light known to physicists. These units are called photons.

Notes: Discover, 1/06, p. 36, Anne Sasso, "Photosynthesizing Life-Form Exists Without Sunlight." Image: White smokers at Champagne Vent, Eifuku, Japan. (PD)

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