This is not exactly a thread hijack, but maybe a little drift:
So when DO you replace a helmet that's never crashed? Lise says she got a new one after three years. I honestly can't remember how old mine is, but it's probably at least three years.

And how about just dropping it on the pavement, without a head in it? Does that compromise its integrity and life-saving potential?

Anybody know the answers to these questions? Inquiring minds (that want to stay that way!) want to know.