Whale oil was used in automobile transmissions as late as 1973.
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The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
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The IRS processes more than 2 billion pieces of paper each year.
28
Attics were invented in Attica.
43
Scientists in China have built a prototype high-speed maglev train that is theoretically capable of reaching speeds of up to 1,800 mph (2,900 km/h).
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