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Publisher's Summary

In this issue:

"Tales of a Stone Age Neuroscientist": By honing ax-making skills while scanning their own brains, researchers are studying how cognition evolved.

"The Neutron Enigma": Two precision experiments disagree on how long neutrons live before decaying. Does the discrepancy reflect measurement errors or point to some deeper mystery?

"The Cancer Defense": Enhancing the body's own immune system is leading to promising results in the battle against malignancy.

"Machine Life": Synthetic biologists are close to putting living cells to work diagnosing human diseases and repairing environmental damage.

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