Colin Dwyer

The first day back in the classroom went quickly. The half-day for students at Marjory Stoneman Douglas High School in Parkland, Fla., was their first at school in two weeks — but what the day lacked in length, it balanced with heartbreak and hope.

For the first time since a gunman claimed the lives of 17 of their classmates and teachers, wounded 14 others and took aim at many more, the survivors gathered again Wednesday to resume studies the killings put on pause.

Afghan President Ashraf Ghani opened an international conference Wednesday in Kabul with a substantial overture to his government's longtime antagonist: If the Taliban comes to the negotiating table and recognizes Ghani's government, the Afghan leader would in turn offer the insurgent group a role as a legitimate political party and release Taliban prisoners.

Updated at 7:40 p.m. ET

Walmart and Dick's Sporting Goods say they won't sell guns to customers under 21, and both are putting new restrictions on ammunition sales.

Dick's Sporting Goods, one of the largest sports retailers in the U.S., has announced it is immediately ending its sales of military-style semi-automatic rifles and is requiring all customers to be older than 21 to buy a firearm at its stores. Additionally, the company no longer will sell high-capacity magazines.

The South Korean women's curling team, hometown rock stars of these Winter Games, put on quite a show for a rollicking arena in Pyeongchang on Friday. The team defeated Japan in the semifinals, 8-7, claiming the nail-biter victory only after both teams went tied into an extra end.

For the hundreds of thousands of Rohingya Muslims who have fled Myanmar and what authorities describe as a brutal campaign of ethnic cleansing, the prospect of returning to their home villages might be more than just daunting. As satellite photographs show, a return home might be simply impossible.

It wasn't the Miracle on Ice, exactly — but when the U.S. men's curling team squared up with their Canadian counterparts in the Olympic semifinal, few could have expected what happened next. Canadian men have won gold at each of the past three Winter Games, after all, and Americans had never — ever! — won an Olympic semifinal.

That all changed Thursday.

The U.S., led by captain John Shuster, shocked the traditional powerhouse in the close contest, riding a late surge of momentum to win 5-3.

Russian police detained Alexei Navalny for less than an hour Thursday, the prominent opposition leader tweeted Thursday. Navalny said that during the brief arrest, which came just as he was leaving a dental appointment, officials warned him that he faces up to 30 days in prison for organizing illegal protests.

"They offered me a lift somewhere," he said, according to a translation by Reuters, "but I declined and have gone to work. I don't understand what happened, and why it took seven people to detain me."

Aleksandr Krushelnitckii has officially lost his Olympic bronze.

As evening settled over eastern Ghouta on Tuesday, the suburb just outside Damascus lay battered by 48 hours of sustained airstrikes. And the approaching night promised still more horror for one hospital.

By 5 p.m. local time, the Syrian American Medical Society says, barrel bombs had begun to fall in a downpour about the medical facility.