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Blackboard, a 20-year-old company, and 10-year-old Canvas, are other popular learning management systems used by US colleges. Teachers can post assignments resources on them in order to foster discussion. Other teaching tools include video conferencing to conduct classes and lectures.

Birx said that everyone on her Delaware trip belongs to her "immediate household," even as she acknowledged they live in two different homes. She initially called the Potomac home a "3 generation household (formerly 4 generations)." White House officials later said it continues to be a four-generation household, a distinction that would include Birx as part of the home.

Born and raised in Wuhan, capital of Hubei province, he dreamed about going there to enjoy the beautiful winter scenery, which is rarely seen where he lives some 2,500 kilometers away.

Boeing on Wednesday reported its first annual loss in more than 20 years from fallout of the worldwide grounding of its 737 MAX.

Books on international cooperation against the COVID-19 pandemic were published by China International Publishing Group during the Shanghai Book Fair on Wednesday.