for the longest time i couldn't figure out why the guy from a beautiful mind writes on windows

... apparently it's a lot cheaper to use windex than a erasers and chalk..

... so it's not a hollywood ploy for good cinematics with equations on windows... it's penuriousness

try writing on windows more than whiteboards in the future..

... to save the chalk... and to use more windex o.O

They do that a lot at my office building. Not to save money or anything like that, more because it gives more writing surface.

they write on the windows at your office?? pics? o.O

Too boring. Financial calculations and such written on the inside office windows