U.S. President Barack Obama and New York Mayor Michael Bloomberg attend the New York City Science and Engineering Fair at the American Museum of Natural History in New York

 
U.S. President Barack Obama and New York Mayor Michael Bloomberg attend the New York City Science and Engineering Fair at the American Museum of Natural History in New York
U.S. President Barack Obama and New York Mayor Michael Bloomberg attend the New York City Science and Engineering Fair at the American Museum of Natural History in New York, in this file photo taken March 29, 2011. REUTERS/Jim Young