>>I wonder what would that sport look like if they were allowed to wear helmets.
>
>Against a tennis ball? Jeez!

On just a bicycle? (hey, don't go all religious on me now)

>Like I said, you've been lucky. Had your head hit the concrete, we might not be having this conversation at all.

My point was that I have learned my limitations and how to live safely with them. May not work for others, not a general recipe, don't try this at home, professional driver on a closed course, YMMV etc.