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March 21 is the busiest day on the U.N. calendar of international observances. Here's what you need to know.

In an artificial intelligence breakthrough, a computer program has become the first to pass the Turing Test, according to scholars in England. Designed by Alan Turing, the test is meant to distinguish machines from humans in a series of natural language conversations. This program fooled humans into believing it was a 13-year-old boy.

The campus can be a laboratory of great experimentation — especially when it comes to American English.

Newly released pictures of President Vladimir Putin show him working out at a gym and grilling steaks with his prime minister. It may be part of a government effort to boost Putin's approval ratings.

Iftah Ya Simsim was one of the earliest foreign-language Sesame Street spinoffs when it launched in 1979. But the beloved show went dark when its studio was partially destroyed during the Gulf War.

Before Christmas Eve dinner, some families share the oplatek along with good wishes for each other. The tradition dates back hundreds of years: Back when bread was scarce, exchanging it with neighbors was a gesture of goodwill.

Early in 2019, China hopes to land a rover — the first soft landing on the moon's far side. The mission is exploratory, and will lay groundwork for a trip by Chinese astronauts to the lunar surface.

The sale at Christie's of Salvator Mundi,which dates from around 1500, easily tops previous records set in 2015 for a Picasso sold at auction and a Willem de Kooning sold privately.

The Venezuelan president remains in Cuba, receiving treatment for cancer. His supporters — with the backing of the Supreme Court — say that he can be sworn in at a later date.

A scheduling snafu for organist Jan Kraybill started an unique tradition — a Super Bowl Sunday organ concert — that's lasted 25 years.