"There are billions of neurons in our brains, but what are neurons? Just cells. The brain has no knowledge until connections are made between neurons. All that we know, all that we are, comes from the way our neurons are connected."

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Although we tend to think of the brain as a discrete organ - a lump of squidgy tissue - it is better to think of it as part of an elaborate network of nervous tissue that reaches out to every single part of the body.

— Tim Birkhead