What is the most populous US state?
California is the most populous US state, with about 39 million people.
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- Why was the Chicago River reversed?
“In 1900, engineers reversed the flow of the Chicago River to keep sewage out of Lake Michigan, the city's drinking water source.”
Reference: American Society of Civil Engineers (ASCE)
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What is the longest flight caused by a propane explosion?
A railroad tanker car carrying propane traveled over 3,000 feet when it exploded during a train wreck in Illinois, sheering off a steel tower in it's path. It's the longest flight on record for a propane explosion.
How accurately is the Great Pyramid aligned?
The Great Pyramid's sides are aligned almost exactly with true north, south, east, and west, a stunning feat of precision for ancient engineers.