On Friday, the World Health Organization labeled a new variant of the coronavirus, called Omicron, as a variant of concern. WSJ's Gabriele Steinhauser explains how scientists in South Africa noticed it so quickly, and what's known about Omicron so far.

We are bringing you the complete story of uBiome. It was a biotech company with promise: charismatic leaders, an exciting product and lots of venture-capital funding. So why did the FBI end up raiding its office? And why is the government calling its leaders fugitives? WSJ's Amy Dockser Marcus tells the story of uBiome's spectacular downfall.

A post on tennis player Peng Shuai's social-media account made a startling accusation: that a former top official of the Chinese Communist Party had sexually assaulted her. Then, she disappeared from public view for more than two weeks. WSJ's Joshua Robinson explains how the head of the Women's Tennis Association is speaking out against China and putting the organization's business on the line.