While seated in a shopping centre cafeteria I noticed four men of different ages all jiggling their right legs up and down while eating or talking. I timed their 'jiggles' at approx 208 times a minute and this seemed similar for each?
Please assume that there are no lenses or mirrors in place to collect more of the sun's heat than would normally reach the body. I understand that the body needs to be "black" and perfectly insulated on shady sides. I'm really asking (I think), what is the temperature of a sunbeam?