The day within and the day without -- Telling time -- Oscillators, clocks and hourglasses -- The challenge of daily change -- The search for the clock -- Light on the clock --The molecular clock: protein 'tick' and RNA 'tock' -- A few species and many clocks -- The changing seasons -- Clockwork evolution -- Sleep and performance -- SAD shifts -- Time to take your medicine -- Future times: uchronia or dyschronia.
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