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Developmental psychologists are trying to figure out what very small children know and when they know it. The answer: a lot, and a lot earlier than you think. One experiment finds that 18-month-olds can reason abstractly when sorting blocks, well before they are able to explain it.

It was the spring of 1999 in Moscow, and two of the 20th century's great revolutionary leaders, South Africa's Nelson Mandela and Russia's Boris Yeltsin, were having their first face-to-face talks as presidents of their nations. Yeltsin was struggling, but with a few simple gestures, Mandela changed the narrative.

Watching violent movies makes teenagers more aggressive, and that violence is almost always associated with sex, drinking and smoking. Violent characters in PG-13 movies are as likely to indulge in violent activities as those in R-rated flicks.

Brazilian food used to be treated as the poor cousin of more renowned European cuisines. But not anymore. Brazilian food is having its moment in the sun. And chefs think that with the World Cup and the Olympics coming, it's going to get even bigger.

The court said only Parliament can change the colonial-era law. The decision, which reverses a landmark lower court ruling that decriminalized homosexual acts, is being called a major setback to gay rights in the country.

Live at Carnegie Hall captures a riveting experience with the Metropolitan Opera Orchestra and a beloved conductor, James Levine, who has been plagued with a variety of medical troubles.

Republicans are framing their central question about the troubled Affordable Care Act website this way: Are White House officials clueless or are they liars? A Democratic lawmaker, meanwhile, accuses the GOP of holding a "monkey court."

Another day, another round of controversy about the NSA surveillance of foreign leaders. Will the White House have a response to the outrage voiced by Europeans and others?

The Affordable Care Act's early travails are yielding some lessons for future presidents and lawmakers. Here are three.

The Swedish housewares retailer, which is already using renewable energy to power many of its own stores, says it wants to tap into a growing demand for solar.