A traveler stands in an airport concourse with a boarding pass in one hand and a half-finished coffee in the other. A set of recycling and trash bins is ahead. The traveler has seconds to decide what to do. The traveler glances at the bin labels, hesitates, and then drops the cup into one of the openings. Whether they choose the correct opening depends a lot on what the labels present. Trash is simple. You set out a bin, people use it, and someone empties…
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