Can you pass this 1980s quiz?
The arrival of which comet in 1986 was met by a series of American, Soviet, Japanese, and ESA probes?
Comet Kohoutek
Borrelly's Comet
Halley's Comet
Comet Encke
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Imagine that you and your brother have the same amount of pears. How many of them should he take from you to have 10 more pears than you have?
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A secret message was engraved inside Abraham Lincoln's . . .