Bryn Mawr organizes this site. It has a lot of student generated work on it along with some really great links to some very focused topics/ articles in the sciences including sleep, computer-science issues, the brain, teaching strategies, etc. Well worth checking out. Some great hands-on student activities are included. content changes with pretty decent frequency
This site has links to videos, Ted Talks, University sites with great links to lessons/ conversation starters, etc around all the sciences. a great one-stop shopping facility for great supplements to classroom content.