PLEASE -- wear a helmet when you ride a bike. Studies now show that cyclists > 30 benefit even greater
I always wear one and I make my kids wear their's too.
I've seen way too much head trauma in my career and even a fall at low speed can be devastating.
"Helmets need not be expensive or unstylish, and they're worth the trouble of wearing: the changes of aging make people over 30 more vulnerable to head injuries."