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Chemical Experiments for Cubs

http://www.faqs.org/faqs/scouting/leader-hints/section-7.html

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Sea and Sky: Travelport Entrance

http://www.seasky.org/

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Build a Newtonian Physics Machine

http://spaceplace.nasa.gov/momentum/en/

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Building an Inexpensive Galilean Style Telescope

http://galileo.rice.edu/lib/student_work/astronomy95/telescope_design.html

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