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http://janus.astro.umd.edu/astro/scinote/ http://www.edinformatics.com/math_science/scinot_mult_div.htm http://www.aaamath.com/B/g6_71fx1.htm#section3 http://www.powersof10.com/film http://www.wwnorton.com/college/chemistry/gilbert2/chemtours.asp http://web.mst.edu/~gbert/links.html