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Aug 9, 2017, 10:58 am57 ptsENN
Look down on Buenos Aires from the sky, and you can learn a fair bit about the city. It's got a lot of concrete. Also a lot of trees. There's a bright green river delta to the north, which probably explains the ruddy-brown bay to the east. But with the right camera—a hyperspectral one—you can pick up a…
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