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- 1. Circadian rhythms: A 24-hour phenomenon
- 2. Time of day matters
- 3. When timing goes wrong
- 4. Shedding light on the clock
- 5. The tick-tock of the molecular clock
- 6. Sleep: The most obvious 24-hour rhythm
- 7. Circadian rhythms and metabolism
- 8. Seasons of life
- 9. Evolution and another look at the clock