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Two pigeons sneaked aboard a Delta Air Lines plane, delaying the flight twice. The airline confirmed that the pigeons got aboard a flight Saturday that was leaving Minneapolis for Madison, Wisconsin. A passenger who shot video of another man using his jacket to capture one of the birds told news outlets that the plane had … Read more
By January 2020, Papadimitriou had been thinking about the pigeonhole principle for 30 years. So he was surprised when a playful conversation with a frequent collaborator led them to a simple twist on the principle that they’d never considered: What if there are fewer pigeons than holes? In that case, any arrangement of pigeons must … Read more
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