Buckskin Diplomacy
The objects Lewis and Clark acquired in negotiations with Indian nations have much to say.
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Free Speech, the Bomb—and Donald Trump
A Harvard cardiologist on the unlikely alliances that shaped a global movement to prevent nuclear war

Your Views on Harvard’s Standoff, Antisemitism, and More
Readers comment on the controversial July-August cover, authoritarianism, and scientific research.

Why Heat Waves Make You Miserable
Scientists are studying how much heat and humidity the human body can take.