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It's complicated.

The short answer is, "wear a helmet if you have one, and try to get one, but if you don't have one, you should still bike anyway."

Not in the Netherlands, see the article ;)

I also remember reading this.

I think even safer (i.e. drivers keep more distance while overtaking) than no helmet was pretending to be female by wearing a wig with long hair.

Also making it mandatory to wear a helmet means fewer people use bicycles, so fewer people get the health benefits of cycling.