"...look into all things with a searching eye” - Baha'u'llah (Prophet Founder of the Baha'i Faith)


Jan 20, 2014

Can a person get a suntan through a window?

No. The ultraviolet radiation that causes suntan does not pass through glass. A tan is the skin 's natural defense against these harmful sun rays. Pigment cells in the lower skin level make more pigment and melanin to absorb the ultraviolet rays. As the pigment spreads into the top layer of the skin, it becomes darker. (The Handy Science Answer Book, compiled by the Science and Technology department of the Carnegie Library of Pittsburgh)