PBS NewsHour

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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...
Former United States President George H. W. Bush is brought into the auditorium where his son Former United States President George W. Bush speaks about his new book titled “41: A Portrait of My Father” at the George Bush Presidential...
A police vehicle is seen a poster with a photo of drug lord Joaquin “El Chapo” Guzman offering a reward of 60 million Mexican pesos for information along a street in Mexico City on July 16, 2015. Photo by Henry Romero/ReutersWASHINGTON...