Despite their simplicity, lack of a brain, or sense of sight and smell, slime moulds seem to be much smarter than they let on. They can learn new information and pass it down to future generations, and can be as efficient as human architects. For example, the species Physarum polycephalum, recreated the layout of the Tokyo rail system — famous for its intuitiveness — when scientists used oatmeal, one of its favoured foods, as markers of population centres.
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