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Professor Jordan Ellenberg gives students points for recognizing when they get a wrong answer, even if they can't figure out why. In his new book, he writes that good math is about good reasoning.

Author Eric Weiner identifies Renaissance Florence, Classical Athens and Silicon Valley as "genius clusters." And he explains how the right amount of friction and competition can help geniuses thrive.

Israeli writer Etgar Keret wrote his first piece of nonfiction the day his son was born. Later, when his father became terminally ill, he decided to publish his essays as a "living tombstone."

Nearly 50 years ago, a fight between billboards and natural beauty played out on the national stage. Now the struggle has moved to the states — like Texas, where activists face off with corporations.

My heart fell when a counselor called to say he was worried something bad might have happened to Nat, my severely autistic 25-year-old son. Nat has trouble talking, and was teary. What should I do?

Healthpoint Services says it has a business model that will not only help the world's low-income populations — but also make a profit. Based in India, the company offers patients videoconferences with doctors, cheap diagnostic tests and clean water. And it hopes to spawn imitators as it proves it can be profitable.

Healthpoint Services says it has a business model that will not only help the world's low-income populations — but also make a profit. Based in India, the company offers patients videoconferences with doctors, cheap diagnostic tests and clean water. And it hopes to spawn imitators as it proves it can be profitable.

The Utah Data Center, 26 miles south of Salt Lake City, will begin operations in September. Though the NSA director has said it won't hold data on U.S. citizens, privacy advocates worry about the agency's expanding capabilities.

All Songs Considered's favorite electronic jams from February include a legit underground anthem, African field recordings, and yet another promising producer from Detroit.

Thomas Piketty's Capital in the Twenty-First Century evokes another famous tome with "capital" in its title, and makes comparisons inevitable.

From ancient China to its modern rise, from the searing feuds of the Middle East to the cultural contradictions of Rio, our international staff offers up some of the best books of 2015. Enjoy.

The confounding title of the self-referential novel Percival Everett by Virgil Russell signals its method, which seeks to erase lines between author and subject, reality and fiction. For Alan Cheuse, Percival Everett's (or is that Percival Everett's?) postmodern mind games spoil what might have been a fine novel.