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FAA issues nationwide ground stop

The Federal Aviation Administration on Friday issued a rare nationwide ground stop on all departing flights, U.S. Secretary of Transportation Sean Duffy said.

Why Jensen Huang Was Essential to Nvidia’s Rise

Jensen Huang was the driving force at Nvidia, with 60 direct reports and no clear succession plan. Tripp Mickle, one of our technology reporters, examines Mr. Huang’s central role in the company and the artificial intelligence industry.

What's going on with the polar vortex?

Observations show the ring of fierce winds that rotate at the Earth's North Pole has changed direction. Scientists say it's a historic disruption and the earliest reversal on record. What could it mean for the weather?