A Penn State power-system expert cites laws of physics to pull the plug on worries that a terrorist attack on a minor substation could bring down the entire U.S. electric grid.
Looking to goose American participation in science, math and technology, President Obama's "Sputnik moment" lacks the urgency and clarity of the original.
University of Georgia professor William Kisaalita engineers simple, practical solutions — a milk chiller, a nutcracker and an egg incubator — for Africa's rural poor.