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The Tampa airwaves are getting a little crowded. With more than 50,000 visitors expected at the Republican National Convention -- many of them wielding data-hogging smartphones and laptops -- wireless providers are adding new cell towers, Wi-Fi hot spots and temporary cell sites. Tech Tuesday goes behind the scenes at the convention.
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. We look at the fundamental economic problems in Puerto Rico and Greece, and how they could affect economies in the U.S. and worldwide.