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Submit ReviewWhy do monkeys have tails, but chimpanzees and humans don't?
These big changes in evolution can be hard to pin down, but scientists say they've identified a specific genetic change which removed tails in the entire ape family tree.
Guest: Dr Jonathan Webb, ABC Science Editor
BRAINTEASER (answer in the audio):
What comes next in this sequence? 31 ... 41 ... 59 ... 26 ... ?
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