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In places where power is scarce and refrigerators are scarcer, scientists have found ways to power the ice box with the heat of the sun. The sun is a mass of incandescent gas, a gigantic nuclear furnace where hydrogen is built into helium at a temperature of millions of degrees. But despite its intense heat, it's being used to do something paradoxical: provide refrigeration (apologies to They Might Be Giants).

All 22 sunscreens tested by consumer nonprofit protected against solar radiation, but some performed better than others - and cost less