What is the most complex structure in the universe? I'll give you a hint: it weighs only a few pounds, and you own one.

Ref: Finn, Robert. 1983. "Amnesia: case of a fragmented past." Science Digest, Nov. p. 72. Photo: A pyramidal neuron from the hippocampus, stained for green fluorescent protein. PLoS Biology Vol. 4, No. 2, e29. Licensed under the Creative Commons Attribution 2.5 Generic license.

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