Cuba: USAID hit by spying scandal
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This week, new tensions flare up between the US and Cuba. Havana says a US development agency has been trying to recruit anti-government activists from nearby nations. Also, Barack Obama hosts the first ever US summit with Africa. He promises $33 billion in US investments, but that's still far behind the continent's trade with both Europe and China. Finally, we head to Mexico where a group of high school students have come up with a way to treat waste water... thanks to a cactus!