Are you a night owl or a morning lark? Noted researcher Dr. Seymour Benzer discusses how the difference between he and his wife sparked his interest in the topic of biological clocks.
The bobtail squid swims during the night to hunt. During the day, it burrows to hide from predators.
Dr. Benzer is joined by Dr. Ron Konopka for a brief discussion of how the per gene is involved in mammalian clocks.
This time-lapse videoclip shows human circadian activity while assembling a T. rex skeleton.
This time-lapse videoclip illustrates a mouse's nocturnal behavior.