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"About 70 percent of our energy comes from non-renewable sources like oil and natural gas. When they&amp;#039;re gone, they&amp;#039;re gone for good. Learn some simple ways to conserve energy through these five simple experiments."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/environmental/conservation/conservationists/5-experiments-conserving-energy5.htm>