Don't wear helmets, wear wool beanies!
I got in touch with black ice under a little bit of snow a little while ago. The bike just disappeared under me and I was plowing the road before I knew it.
Luckily I had my thick wool beanie on which softened the impact of my head hitting the ice. The beanie did not crack or break since... well it's a beanie. But I am sure it did compress and take most of the impact. Without it I am sure I would not be writing this since I would surely have serious TBI or I might even be dead.
Wear your wool beanies people!
(do i have to use the sarcasm mark somewhere?)