Flying Through Inner Space

It's hard to truly see the brain. I don't mean to simply see a three-pound hunk of tissue. I mean to see it in a way that offers a deep feel for how it works. That's not surprising, given that the human brain is made up of over 80 billion neurons, each branching out to form thousands of connections to other neurons. A drawing of those connections may just look like a tangle of yarn.

As I wrote in the February issue of National Geographic, a number of neuroscientists are charting the brain now in ways that were impossible just a few years ago. And out of these ...

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