diamonds in the rough

It is suggested that the Internet will mean the end of our scientific evolution. Like real evolution it goes fastest on small isolated islands. With the Internet at everybody's fingertips we have become a collective brain. And this might kill creativity.

However, the Internet can also be used to further the cause of science. In this post I will put links to sites that really are gems in the pornographic rough of the World Wide Web. Here's two to wet your appetite :
http://www.periodicvideos.com/
http://www.sixtysymbols.com/