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"Earlier we were reliant on the intuitions and experience of the local operation team. With the use of technology like AI and big data, we are getting more accurate answers."

"Dr. (Anthony) Fauci said don't wear a mask, our surgeon general -- terrific guy -- said don't wear a mask. Everybody was saying don't wear a mask, all of a sudden everybody's got to wear a mask," Trump said. "And as you know, masks cause problems too. With that being said, I am a believer in masks. I think masks are good."

"Different from SUE, the cast will allow visitors to walk under it and touch it," said Hillary Hansen, senior exhibitions project manager, the first-ever display to permit such access by visitors.

"Due to a later than usual Thanksgiving holiday, we saw retailers offering omni-channel sales earlier this season, meeting consumers' demand for the best deals across all channels and device," Steve Sadove, senior adviser for Mastercard and former chairman of Saks, said in a statement. "E-commerce sales hit a record high this year with more people doing their holiday shopping online."

"Drawing on experience gained from Wuhan, this time the treatment was not as hurried," Jiang says.