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What's Oil Shale?
science.howstuffworks.com/environmental/energy/oil-shale.htm
Oil shale is just one unconventional oil source that's being researched. Learn how oil shale could save the day when — and if — we hit peak oil in the U.S.
10 Best Volunteer Activities in Retirement
What are some best volunteer activities in retirement? Learn about 10 Best Volunteer Activities in Retirement at HowStuffWorks.
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