There are multitude of wonderful sources in the natural sciences on the world wide web. This valuable site (worthy of a bookmark) is a life-science dictionary:
http://biotech.icmb.utexas.edu/search/dict-search.html

These are interesting interactive sites modeling the cannon ball problem:
http://jersey.uoregon.edu/vlab/Cannon/
http://www.cs.utah.edu/~zachary/isp/applets/Cannon/Cannon.html

This site provides information about a career in mathematical sciences:
http://www.ams.org/careers/

This site provides information about a career in actuarial sciences:
http://www.dwsimpson.com/

This site provides information about a career in astronomy:
http://curious.astro.cornell.edu/careers.php

This site provides information about a career in the life sciences:
http://www.the-aps.org/education/k-12misc/careers.htm

This site provides information about a career in biophysics:
http://www.biophys.leidenuniv.nl/Research/

This site provides information about a career in kinesiology:
http://www.sonoma.edu/Kinesiology/#Kines

This site provides information about a career in environmental sciences:
http://www.umaine.edu/pse/

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