How many days is the Olympic decathlon held over?

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What Big US East school took the cryptic name for its sports teams from the Greek word for "what"?

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In which city is the world famous La Scala opera house?

In radio, what does AM stand for?

When was the Pioneer 10 space probe launched into space?

By what common name do we refer to "hook and loop" fasteners as?

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What European leader was also known as "Charles the Great"?