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Recalling the days when it was cool to chase after UV rays

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Probably because I was a frail child, my grandfather told me one summer when I was in elementary school, "If you don't go out and catch some rays, you are going to catch a cold in winter."

After the summer holiday was over, I felt envious as I watched a deeply tanned classmate standing on the stage to receive a prize.

Ultraviolet rays are interesting, in that even though they are invisible, they are sometimes worshipped, but utterly abhorred at other times.

Ever since they were discovered in 1801 by a German physicist, their evaluation has oscillated violently between "beneficial" and "harmful," according to a recently published book titled "Shigaisen no........

© The Asahi Shimbun

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