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The science of waiting in modern courtship.

The sweet, avian romance of Harold and Maude.

Many of terrorism’s most profound consequences are felt from a distance.

From ecstasy to withdrawal, the lover resembles an addict.

The powerful allure of the deep azure.

The universe’s greatest sinkholes have no trouble swallowing anything—except themselves.

Meet Xiaoice. She’s empathic, caring, and always available—just not human.