When Karl Deisseroth was studying to be a doctor in the 1990s, he took a rotation working with psychiatric patients. It would start him down a path of discovery about how the brain works that would eventually lead him to become a Nobel laureate.

The brain is billions of fragile, extremely vulnerable, transparent, very fast-acting cells. It’s a very challenging system to study, and of course, buried within the skull and doing very complex things … I was very much impressed with the magnitude of the challenge.

The brain is billions of fragile, extremely vulnerable, transparent, very fast-acting cells. It’s a very challenging system to study, and of course, buried within the skull and doing very........

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