when did solar energy begin
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when did solar energy begin
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when solar energy was invented
when was solar energy first used
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origins of solar energy
when did solar energy begin, when did people start using solar energy, when did solar energy start being used, when solar energy was invented, when was solar energy first used, when was solar power introduced, when was solar power created, first solar energy history, history of solar energy timeline, when was solar power made, origins of solar energy