Exploratorium
Exploratorium: Science Snacks: Snacks From a Z
Here is a monumental list of ideas for science fair projects and experiments, organized alphabetically. Every one of them is a link to a full page, with pictures, of information about the idea. This site is a goldmine.
University of Utah
University of Utah: Genetic Science Learning Center: Dna and Verdicts
Part of a site on genetics, this page explores DNA as a forensic science. Explains how and why DNA can be used to convict or acquit a criminal from wrongdoing using forensic DNA analysis. Teacher resources too.
Fundación Cientec
Cientec: Biology
Simple step by step experiments that will allow students to explore the world of Biology. Concepts of genetics, metamorphosis, human and plant physiology are investigated.