Wonkbook: The controversy over whether gay men should be able to donate blood

By Max Ehrenfreund and Ariana Eunjung Cha Hours after what is believed to be the deadliest mass shooting in U.S. history in Orlando on Sunday, a blood-donation foundation issued a plea for help. "Dozens of people have been injured and taken to area hospitals," read the message from OneBlood. "There is an urgent need for O Negative, O Positive …   The latest economic and domestic policy from Wonkblog   People embrace outside the Orlando Police Department during the investigation of mas shooting Sunday morning. REUTERS/Steve Nesius By Max Ehrenfreund and Ariana Eunjung Cha Hours after what is believed to be the deadliest mass shooting in U.S. history in Orlando on Sunday, a blood-donation foundation issued a plea for help. "Dozens of people have been injured and taken to area hospitals," read the message from OneBlood. "There is an urgent need for O Negative, O Positive and AB Plasma blood donors." Forty nine people were killed in the incident at Pulse, a gay nightclub, and another 53 were injured, authorities said. Those figures did not include the gunman, identified as Omar Mateen, 29, from Fort Pierce, Fla., who was killed in a gun battle. On social media, some noted a grim irony: Although Mateen had chosen a gay club as his target, it is still very difficult for gay men to donate blood in the United States. Read the rest on Wonkblog.   Chart of the day Moving to a new place might increase the risk that children will go on to abuse substances or commit violent crimes as adults, research suggests. 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