Scientists routinely do experiments in highly controlled laboratory conditions. The more controlled the better the results are likely to be. Chronobiologists have described how clocks respond to defined stimuli and how they establish a steady state in a cyclic laboratory environment, such as a 12 hour light, 12 hour dark cycle. But are these insights also valid in the real world? In his lecture on the human clock in the real world, Till will approach this important question by describing the timing of human behavior in everyday life. He'll tell you how individuals young, old, male, female, lark and owl, behave in their temporal structures of work and free days. He'll show that different individuals actually have to be different chronotypes to synchronize appropriately to the 24 hour day. You'll need this knowledge to understand why people in the eastern part of a time zone behave differently to those in the west. Why schools should adapt to the circadian clocks of teenagers, why many of us suffer from something called social jet lag, and why daylight saving time may cause problems for the circadian clocks of many people. [SOUND]