When I met Tony Martinez, the mayor of Brownsville, Texas, he had a somewhat wacky argument against the border fence that separated the town from Matamoros, Mexico. "We are about to become an interplanetary civilization," he told me. "And here we are talking about a wall separating what is essentially the same community." The reason he said so is that Brownsville is included in Tesla founder Elon Musk's rather specific plans for the colonization of Mars, published in the June issue of the journal New Space.
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