Open Culture recently posted 500 Free Online Courses by Top Universities– the courses are organized by content and of course there are a few science classes that may be worth checking into over the summer. Or not 🙂 Lots of biology, chemistry, physics and others.
See Science & Cooking: The Many Faces of Chocolate embedded below
http://www.youtube.com/watch?v=HS263kcm8Jc&feature=player_embedded#!
Science for All 