Jiminey Crickets

Tonight I heard crickets for the first time this summer! I counted the chirps of one little guy who sounded close-by: 80 chirps per minute. According to A. E. Dolbear, a physics professor at Tufts College in 1897, that works out to about 60 degrees fahrenheit, where T=50+(N-40/4).  Well, I came in and checked my weather gadget ... it registered 68. Close enough.