Numbers

By Melissa August, Harriet Barovick, Elizabeth L. Bland, Sean Gregory, David Robinson And Rebecca Winters

101 Passengers injured in the derailment near Washington of an Amtrak passenger train, a crash investigators say may have been caused by heat-induced railroad damage

118[degrees] Temperature of the rail before the accident

44 Percentage by which regular mammograms reduce breast-cancer deaths, according to a new, long-term study

7 Number of studies reviewed by Danish analysts last fall, leading them to claim there was no evidence mammograms are beneficial

$22 million Donations to Washington's National Zoo inspired by popular giant pandas Mei Xiang and Tian Tian

1,100 Giant pandas left worldwide

21 Percentage of Major League Baseball fans who think the players, not the owners, care more about their interests

18 Percentage who think the owners are more concerned

53 Percentage who think neither care

Sources: USA Today; Cancer; Washington Post; Gallup Poll