BenTha'er-Horizons

Blue Sky

I read a book a number of years ago called "The Cuckoo's Egg" which was about a physicist finding the trail of a major computer hacker/bad guy. The physicist worked at UC-Berkeley and described how one test he took for his advanced degree was a question of "Why is the Sky Blue?". Well, hundreds of years ago, a scientist invented the cyanometer just to measure the blueness of the sky. Read about it here.
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