41% if bike riders at Stanford wore masks. Only 17% wore helmets.
https://stanfordreview.org/stanford-bicycles-helmets-masks/ …
H/t @tylercowen @MargRev
I think we have a new way to rank Universities!
Are you up on the literature about bike helmet efficacy? Last I looked into it, it was really uncertain how the value of a helmet if you hit your head compared to the disvalue of a helmet in causing non-head injuries to turn into head injuries. I've been curious about this!
