As the centuries go by, our most cherished art historical masterpieces face some inevitable wear and tear. A darkening varnish might obscure an artist’s original vision, or atmospheric conditions ...

Sometimes, the things we can do for our happiness are small and easy: getting a little sun, saying thank you, lending a hand. Other times, they take a little more practice and work. That’s the case ...

Self-driving cars merged onto Bay Area freeways, artificial intelligence reshaped classrooms and offices, and political battles over housing, immigration and public safety spilled into daily life in ...