Sleepless on schedule
The article “Full moon may mean less sleep” (SN: 8/24/13, p. 15) brought up a very interesting hypothesis that besides a 24-hour circadian clock, we may also have a lunar clock. To me that makes sense. Just like our bodies can store fat to use when food sources run low, I imagine over the eons our bodies prepared subtly to use the extra light to do more if needed. Taking advantage of extra light on a fixed schedule no doubt evolved in our ancestors and remains with us to this day.
Linda McBride, Boynton Beach, Fla.
Edison’s rubbery discovery
How could everyone forget Edison (“On the rebound,” SN: 8/24/13, p. 26)? When the price of rubber