Now tell me everyone is doing that, all the time. I also live fairly north, which is part of why I've learned this about Vitamin D in my own research, and I can't help but notice that stores selling winter coats and gloves and other assorted cold gear don't go out of business ever year because nobody is buying them. Nor do I walk through a crowd of people in the middle of winter and have people point and laugh at me because I'm the only one in a coat.

Come on. You're just arguing to argue and swagger a bit, not because you actually think people are getting enough sun exposure in the middle of winter to get enough Vitamin D and there's nothing to worry about.

Then again, most people aren't getting the equivalent of 15 minutes of index 7 UVB exposure at those temperatures, so it's not quite the same thing, but still.