The nearest thing to the nicotine trap in nature is the process by which a fly is lured into a pitcher plant. So named because it is shaped like a pitcher – the jug not the baseball player. Insects are attracted to the smell of the sticky goo with which the rim and internal surfaces of the plant are liberally coated. The hairs on the plant grow in one direction only – downwards, which combined with the effects of gravity, ensures that the fly travels in the same direction. This is of no concern to the fly because it can fly off whenever it chooses. But why should it even want to fly off? After
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