This is a listing of web sites I thought might be interesting to you. Feel free to browse. And by all means let me know of any other interesting sites to add to the list.
WARNING TO THOSE ACCESSING THE WEB VIA A MODEM (from home, for example): I had a problem with two of these sites, the EPA site and the Integrating Science site. When I clicked on either of those two links, my ISP connection was broken. Very annoying.