The buzzy new Silicon Valley app you're not invited to join and everything else you missed in business news: CNBC After Hours squib's MacKenzie Sigalos brings you the day's top business news headlines, and what to watch as the coronavirus pandemic continues to keep most of America on lockdown. On today's show, the U.S. puts big money behind a new vaccine and CNBC's Ari Levy dives into Clubhouse, a new invite-only social network that's become the darling of Silicon Valley.
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