Vitamin D and sunburn through glass?

Well the way i have always seen things is that glass is a silicon based medium, but its colour, density, etc. will determine whether photons can pass through it or not. In most cases UV radiation is absorbed by glass though. NOW what causes sun burns are in fact quanta (packets) of UV radiation colliding with your epidermis so through glass, you should be theoretical (to a limit ofc) unable to get a burn, you will get hot and maybe a heat burn but not a sun burnt. And about your balding, relax it happens to men and women a like, if you go bald big deal the worst that will happen is your head will go shiny =P Good luck.