WASHINGTON (AP) – President Barack Obama on Tuesday proposed an effort to map the brain’s activity in unprecedented detail, as a step toward finding better ways to treat such conditions as Alzheimer’s, autism, stroke and traumatic brain injuries.

He asked Congress to spend $100 million next year to start a project that will explore details of the brain, which contains 100 billion cells and trillions of connections.

That’s a relatively small investment for the federal government — less than a fifth of what NASA spends every year just to study the sun — but it’s too early to determine how Congress will react.

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