When a night at a restaurant or bar finally comes to a close, most Americans engage in an instinctive ritual. They dig into their wallets, fiddle with their smartphone calculators, and then decide how ...

An inherent principle of publication is that others should be able to replicate and build upon the authors' published claims. A condition of publication in a Nature Portfolio journal is that authors ...

This story is part of The Race Issue, a special issue of National Geographic that explores how race defines, separates, and unites us. About this story The Undefeated—an ESPN website that explores the ...