The tornado that destroyed Moore, Okla., is likely to rank among these costliest twisters.
The deadly tornado that destroyed parts of Moore, Okla., will likely be among the costliest twisters in U.S. history. Here are the 10 most expensive tornadoes since 1950:
Work begins on Mount Rushmore, Sputnik is launched into space, the pope visits America for the first time, Janis Joplin is found dead of an overdose, all on this day.
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