am pretty happy with el capitan so far. but it annoys the hell out of me that i can't have 2 preview windows open at once; sometimes i want to, for example, compare images, or view 2 pdfs...at the same time. Preview no longer supports that, it's always one window only. any recommendations for a simple Preview alternative? just for when i want to do this (view jpgs or something side by side, etc)..? or am i missing something, and there's a way to open more than one window in Preview?