Science Search engines

	http://www.scitopia.org/
	http://www.science.gov/
	http://www.scienceresearch.com/
	http://scitation.aip.org/
	http://worldwidescience.org/
	http://www.scienceaccelerator.gov/
	http://www.techxtra.ac.uk
	http://search.optics.org/