Interesting Websites for Chemistry

Laboratory:
National Institute of Standards and Technology  http://www.nist.gov/index.html
 
Thermodynamics:
U.S. Department of Energy  http://energy.gov
 
Nuclear Chemistry:
U.S. Nuclear Regulatory Commission http://www.nrc.gov 
 
Environmental Chemistry:
U.S. Environmental Protection Agency  http://www.epa.gov
National Institute of Environmental Health Sciences (NIH)   http://www.niehs.nih.gov