FILE - This frame grab from video shows lightning inside a massive tornado on Sunday, May 22, 2011, outside Joplin, Mo.  (AP Photo/tornadovideo.net)

10 deadliest US tornadoes

1902 May 18 114 deaths in Goliad, Texas. 1908 April 24 143 deaths in Amite, La., and Purvis, Miss. 1913 March 23 103 deaths in Omaha, Neb. 1…

In this Dec. 19, 2014 photo, oil pump jacks work in unison, in Williston, N.D. After falling nearly 60 percent from a peak last June, the price of oil has now bounced back 19 percent since late January, closing Monday, Feb. 9, 2015 near $53. (AP Photo/Eric Gay)

Oil on wild ride; How will it end?

After falling nearly 60 percent from a peak last June, the price of oil bounced back more than 20 percent as January turned to February.