World

You've seen the pictures of smog-filled skies over Chinese cities, pedestrians venturing out only in gas masks. But 2017 was the year China finally began to crack down on big polluters.

Now's your chance to learn about an all-female orchestra from Afghanistan, the boy who escaped from Boko Haram, a board game that's all about running away from the matchmaker — and more.

Defense Secretary Jim Mattis says contractors and diplomats will be sent to Eastern Syria to help stabilize the country. They will be protected by American troops already there. Mattis says that besides rebuilding, the increased American presence will make sure diplomatic efforts continue for the future of Syria. Both Russia and Syria have said U.S. forces should leave.

Despite the death toll, the state news agency is calling the attack a foiled attempt. Along with guns, the assailant was also carrying explosives.

To see how the world wastes time ... er, explores cultural phenomena ... check out some of the top videos by country from YouTube Rewind's rankings for 2017.

After trading bellicose barbs with North Korea throughout 2017, the U.S. heads into 2018 with an increasingly capable foe and no clear diplomatic exit ramps to temper the tensions.

One suspected transfer was seen in U.S. reconnaissance photos; South Korean media say ships have sold oil to North Korean vessels about 30 times since October.