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Matt Baume is a writer and photographer in San Francisco, focusing on the science of cities. From hybrid transit to urban frogs to underground rivers to invisible airborne toxins, he dives into the amazing discoveries that make city life possible. Growing up in rural Connecticut, he learned to appreciate nature; striking out in downtown Boston, he learned to appreciate density; and settling in California, he learned to appreciate weirdos. You can follow his work at http://mattbaume.com.