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by raarts 4226 days ago
Anecdotical evidence: when my (Dutch) son of 18 went on a student exchange to the US, he woke up in intensive care after six weeks of helmet-less biking. Nothing ever happened on his 6-year daily 45 mins commute to school in Amsterdam.

When in the US, where nobody is used to bikers, and there are no bikelanes: wear a helmet, when in The Netherlands: nobody does it.