NOVA joins a group of English biologists living literally on a platform in the middle of the Red Sea, who for several years have been studying the crown-of-thorns starfish, notorious for the devastation it has wrought on the coral reefs of Australia and the Pacific.

Have you ever sensed that your body reacts differently at different times of the day? NOVA examines the best and worse times for work, good times for sex drives and your body's most reactive time of day for alcohol consumption.