Hopefully this wont turn in to a Jewish/non-Jewish discussion...
Helmets are a significant innovation in cricket. It's baffling that helmets didn't become commonplace until the 1970s, while cricket has for the most part seen fit to protect the legs, hands and groin area from cricket ball pain.
I'm having a cursory glance at the wikipedia page on cricket helmets which informs me that Patsy Hendren used some protective headwear (self made) in the '30s. Later on Brearley had his own design of protective headwear. Graham Yallop was the first to use a helmet, and Dennis Amiss increased their popularity.
It amazes me that after a series such as Bodyline, no one thought to themselves "it might be a good idea to protect our heads". Sports like football in the USA and horse racing were using protective headgear much earlier than cricket.
I never wear a helmet in cricket anymore, although I used to wear one occasionally. I play a lower grade of cricket these days, but if I came across someone who I considered really quick, I'd put on a helmet. My reflexes aren't quite what they were 10 years ago.
Anyway, this is a bit of a rambling OP to a thread on helmets in cricket.