US Environmental Protection Agency
Epa: Air Toxics Website Nickel
Very detailed information on the chemical element Nickel. Discusses its uses, physical properties, and the potential effects of exposure.
University of California
Bacillus Thuringiensis: How Do Insects Become Resistant to Pesticide?
Insects are known for their ability to develop resistance to insecticides. Currently there are insects resistant to every synthetic chemical insecticide used. There are many factors to developing resistance. In a population of insects...
NASA
Nasa: Repair Shops for Broken Dna
Discover more about the late-breaking research into DNA repair shops located in the cell. The work is being done by NASA scientists who are interested in the effects of radiation on astronauts. (Nov. 7, 2007)