The eye is a complex structure made of millions of specialized cells. Right? Not necessarily. Scientists have studied the origins of a complex eye — with the equivalent of a retina, lens, iris and cornea — within a single-celled plankton. They found that the 'eye' is made of tiny subcellular components — with one piece stolen from a species of red alga1. Hear author Greg Gavelis explain more on the show. Plus, teaching robots to behave ethically and the Australian lizard that uses genetics and temperature to determine the sex of its offspring2. When the heat rises, boys become girls.

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