>"Will Russia invade Ukraine? What Putin wants, and more questions, answered."

The Summer and Winter Games took place in the same year, meaning no Olympic Games for four years.Here's more on why the games were moved to every two years.

>"Qatar Airways is seeking compensation of $618m plus $4m a day after grounding 21 A350s over safety concerns."

>"From killer T cells to non-neutralizing antibodies, this what long-term immunity to the coronavirus might look like."

>"What happens to the economy is contingent on what happens with the Covid-19 virus, and as long as the virus isn’t under control, neither is the US or global economy."

>"American workers have power. That won’t last forever."

>"To get more Americans in electric vehicles, we all need to realize they can do much more than just get us around."

>"The 92nd Street Y in New York and the United Nations Foundation introduced Giving Tuesday in 2012."

>"You can save lives with your giving. Here’s how."

>"Omicron is the newest Covid-19 "variant of concern," according to the World Health Organization."

>"Politics — or the lack thereof — was a key factor."

Will Democrats’ child care plan help millions, or throw the system into chaos?

>"Inflation and supply chain woes aren’t stopping shopping, but they’re changing it."

>"After George Floyd’s death, many white Americans formed book clubs. A year later, they’re wondering, "What now?""

>"Half the world has gotten a Covid-19 shot. Yet the vaccination rate in some countries is less than 10 percent."