1. The tornado that struck Moore, Okla., Monday was the fourth one in 13 years.
3. On May 8, 2003, a tornado injured more than 130 people, destroyed 300 homes, damaged 1,500.
4. On May 3, 1999 tornado was even more devastating. 36 people were killed, 538 were injured, and 8,000 homes were destroyed or damaged. The total damage cost was $1.1 billion, the third costliest tornado in U.S. history.
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