by 
Anonymous
ANSWERS: 6
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Love. Or humour.
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Empathy. Some people don't even know what it is, much less use it.
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The human brain.
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Even though it's not technically on the planet, I would say the sun. Imagine all the electricity that could be generated if every building was roofed with solar shingles http://www.oksolar.com/roof/
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Whale oil. Just kidding. Tidal power. Wall off a barren section of coastline and put a turbine in the wall. When the tide comes in it will fill up the area inside the wall and generate electricity. When the tide goes out, it drains and generates power.
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...the old GRAY-MATTER!!!!
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