In a move that will have ramifications for collision sports, the US National Institutes of Health has formally acknowledged a causal link between repeated blows to the head and CTE
Source: US health body rules collision sports cause CTE in landmark change
Recal l my idea of hemlent-mounted sensors that run on a flashing led in the front/top when a significvant hit to the head, as defined by proper science and measiured by an acceleromter. at scale, very inexpeneive. at the sinple helmet-mounted one; obvs more exp., for app, tracking, recordning, wetc.
