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The parallels are striking: an apparently lone shooter opening fire in a confined space, with guns and ammunition reportedly purchased legally. What lessons can we learn from the 2007 Virginia Tech shooting as the country mourns the victims of the deadly rampage at a Colorado movie theater? Former Virginia Gov. Timothy Kaine reflects on the campus tragedy and the nation's willingness to debate gun control and gun show laws.
Eons ago, cabbage butterfly larvae and the plants they eat began an evolutionary arms race. The result: "mustard oil bombs" that give the plants, and condiments we make from them, distinctive flavors.
Puerto Rico's governor says the U.S. territory cannot pay its billions in debt. Like Greece, it faces a long road to stability. A look at the fundamental economic problems in Puerto Rico and Greece, and how they could affect economies in the U.S. and across the world.