nygh science SIA
Sunday, June 10, 2012
Bibliography
http://www.ehow.com/how-does_5188035_uv-light-kill-bacteria_.html
http://www.weatheronline.co.uk/Singapore/singapore/UVindex.htm
http://en.wikipedia.org/wiki/Ultraviolet
http://extoxnet.orst.edu/faqs/safedrink/microorg.htm
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