Science & Technology Directory [ http://www.spacetransportation.org ]
Hugh science directory with more than 100000 listed science related websites from around the world. Submissions for science related authority sites are free.

Stereo Microscopes [ http://www.1-source-microscopes.com/ ]
Need to focus in on a good microscope? Microscope Source offer a range of microscopes catering for amateurs and educational uses, to specialist geological and medical needs, as well as other items and resources.