It has been known for centuries that the leaves of some plants regularly open during the daytime and close at night. It was always assumed that this phenomenon was a response to sunlight. But over two 250 years ago, in 1729, a French astronomer called Jean-Jacques de Mairan, conducted a very simple experiment which showed that this assumption was wrong. He discovered that this phenomenon occurs even if a plant is kept in the dark. The only possible explanation was that the plant opens and closes in response to some sort of 24 hour internal clock. That was the first experiment in…


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Source: Dr Vernon Coleman - MB ChB DSc Read the original article here: