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How ants build complex traffic systems without any leaders

A few months ago, I awoke to find a streak spanning the length of my kitchen wall that looked like it had been drawn there ...
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The surprising reasons Japan's streets stay clean without trash cans

TOKYO and GIFU, Japan – The mileage my sneakers earned on my first full day in Tokyo was 12.4 miles, and impressively, some of my gum wrappers logged just as much. As one of the world's largest cities ...