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An occasional series on the science of concussions and how new findings are reverberating through sports and society.

Concussion, Inc.: The big business of treating brain injuries

NFL union urges players to see ‘Concussion,’ but warns ‘it is scary’

How the NFL’s concussion-spotting system is — and isn’t — working

New study will examine NFL players’ brains in bid to spot CTE

My muddled brain: A fall, a concussion, and weeks of confusion

A pill for concussions remains a brain-busting challenge

After concussions, young football player’s plea: Donate my brain to science

Disqualified after concussions, college football players recruited back onto the field

Can chocolate milk speed concussion recovery? Experts cringe

Experts debate: How many concussions are too many for an athlete?