Unraveling the Mysteries of Bird Plumage

The horrors of 20 years ago spurred an ambitious transformation, not just at the site of the attacks but across the city’s five boroughs. We visit what has risen from the ashes. A growing body of academic work—and plenty of examples on the ground—suggest countries that most mistreat women are the most violent and fractious. And solving a flashy-hummingbird mystery.

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