"As the mother of a grown son with a traumatic brain injury, I couldn't be more excited about the prospect of finding out how to repair even a small part of the damage that changed his life."

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Just as an informal, nonscientific observation, most people's personalities don't seem to change very much during their lives. There are exceptions in the case of people who go through hugely traumatic events or suffer from brain injury or disease. Some would argue that religious conversions can have deep personality-altering effects. But these are all exceptions to the rule.

— Neal Stephenson