Science

What electronic device only allows current to flow in one direction?

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What percent of the Sun, by weight, is helium?
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How many tiles make up the outer "skin" of Spaceship Earth, in EPCOT?
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What are the big holes and dents found on the Moon called?
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Which bridge has the longest span in the U.S.?
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In which year did the first space shuttle launch?
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Where is the world’s most active volcano located?
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Plato thought the Lost Island of Atlantis was linked to which ancient culture?
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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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