Science
What was the first sound-recording device called?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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Approximately how many miles of wire are there in a 737?
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What inherited syndrome is believed to be part of the make up of many serial killers?
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What is the name of an instrument that records vibrations in the Earth's crust?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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What type of object does the "no-hair" theory describe?
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