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Nigeria’s President Muhammadu Buhari is pictured here at the presidential wing of the Nnamdi Azikiwe International Airport in Abuja, Nigeria on June 11. He is coming to Washington, D.C., to meet with President Barack Obama on July 20, 2015....
Vials containing the molecules that are inserted into cotton fabric to detect unsafe levels of methane gas. When methane is absorbed the molecule changes color, alerting firefighters they’re encountering dangerous levels of the toxic gas. Photo by...