Science

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A few hours before sundown, the vultures arrive by the dozens to roost in Jessica Paulin's backyard. They swoop in, choose the perfect evergreen branch, and with one or two flaps of their massive wings, settle in for the…

Science correspondent Miles O'Brien plunged into a muck of that which rhymes with "it" to investigate our ailing sewage system. Here's his story of what happened underground. Don't miss his full report on tonight's NewsHour.

A river rises in the Andes and flows east to the Amazon, Ucayali River in Peru. Photo by Bates Littlehales/National Geographic/Getty Images TARAPOTO, Peru -- For tropical ecologist Gregory Asner, flying over the Peruvian Amazon from the town…