The "beholder's share" is a deeply personal, socially shaped, active experience rather than the programmed response of brain circuitry that we share with creatures whose entire lives are subordinated to ensuring the replication of the genetic material for which they are vehicles.

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Many researchers now believe most of these disorders share a common origin: clusters of deformed proteins that pile up in the brain over the years, slowly poisoning brain cells.

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In microcontrollers, which serve as the computing brain for a wide variety of devices, the company continues to expand share.

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Many of the players also share a genetic risk factor for neurodegenerative diseases, so perhaps deposits of tau are the result of brain trauma coupled with the weakened ability of the brain to repair itself.

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