About 80 miles northwest of Des Moines, Iowa, lies the small town of Manson. Nothing much has ever happened there, unless you count the time 74 million years ago when a giant meteor crashed nearby. Actually, calling it "giant" doesn't do it justice: The meteor was 1 1/2 miles across, weighed 10 billion tons, and was traveling at 45,000 mph.

Compared with that, the second biggest thing to hit town was almost puny — it measured 60 feet in diameter and 53 feet in height, weighed 42 tons, and moved down the road at a mere 5 mph.

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