In the beginning was a single cell, instinctively moving towards light so that the business of living may continue. For German photobiologist Peter Hegemann, studying the microscopic alga known as Chlamydomonas in the 1990s, the question was straightforward: How did this simple organism respond to light in one-twentieth of the time that it took the human eye to see? The simplicity of the alga’s biology, it turned out, was the key needed........

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