• Monster twister hits Moore, Okla.
• Upper Valley El Paso fire May 20, 2013
• Biggest U.S. lottery jackpots
• Tornado tears through Okla. City suburb
• 10 costliest tornadoes since 1950
• Tornadoes hit Midwest
• Deadliest tornadoes in U.S. history
• Companies that owe workers a raise
• On this day: May 21
• Notable deaths of 2013