This year’s Nobel prize for Physiology or Medicine was given to three scientists for their work in understanding the nature of circadian rhythms, the daily pattern of life that we all, animals and plants alike, follow that seems to be governed by the rate of the Earth’s rotation about its axis. This topic has been of interest as far back as the 18th century when astronomer Jean Jacques d’Ortous de Mairan found that the leaves of mimosa plants opened at the time of daybreak and closed at night, even when they were kept in the dark all the time, suggesting that there was an internal biological clock that was not triggered entirely by sunlight.
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