Science

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http://www.nineplanets.org/
Great site for talking about the planets.


http://www.equationsheet.com/
All kinds of equations for physics and chemistry.


http://www.edheads.org/activities/simple-machines/index.htm
Shows how many simple machines work.


http://paleobiology.si.edu/dinosaurs/interactives/dig/main.html
A virtual dinosaur dig.