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What we know and don't know about Omicron variant

The World Health Organization says it could still take some time to get a full picture of the threat posed by Omicron, a new variant of the coronavirus as scientists worldwide scramble to assess its multiple mutations. Here's a look at we we know about the variant and why scientists are worried.

Passengers queue to check in, at Heathrow Airport in London, Monday, Nov. 29, 2021. (AP Photo/Frank Augstein)

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Twitter CEO Jack Dorsey to step down

Twitter Inc Chief Executive Officer Jack Dorsey will step down from his role and Chief Technology Officer Parag Agrawal will become his successor, Twitter announced on Monday.