10 Things for Know for Friday NYC's mayor, top cop say the Boston suspects' plan to visit the Big Apple wasn't just "to party" after all. People who lost limbs will face some of the biggest medical expenses - artificial legs can cost more than $50,000 each. U.S. tentatively concludes that Syria has used chemical weapons twice during its civil war - though White House says more proof is needed. "To know President George W. Bush is to like him," the president says in helping dedicate Bush's library in Dallas. Israel shoots down a drone off its northern coast and suspicion falls on Hezbollah. The militant group denies involvement. Spring rains soaking the central U.S. have washed away the worst dry spell in decades. The savvy political campaign - including bare-knuckle tactics - could serve as a model for similar efforts in other states. Among examples: South African monkeys switched foods to try to fit in with a new group, researchers say. The Kansas City Chiefs take offensive tackle Eric Fisher of Central Michigan as the top pick in the NFL draft. Conrado Marrero, a former MLB pitcher from Cuba, celebrated his 102nd birthday on Thursday.