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wolphram alpha systematic knowledge
US: Barometric Pressure
to go with experiment
Colorful Chemistry of Acids and Bases
aaaiiiieeeee so cool!
Low and High Pressure
How does a lightbulb work? - Naked Science Scrapbook
note: fire extinguisher ingredients, calcium carbonate and calcium stearate, are also in food/medicine!
Free Teacher Resources | Discovery Education
The Naked Scientists Online, Science Podcast and Science Radio Show