The number of coronavirus cases continues to rise globally, yet positive news about a vaccine and drug treatment helped to drive a stock market rally on Monday. Pfizer and BioNTech said their coronavirus vaccine was more than 90% effective in preventing Covid-19 among those not previously infected. President-elect Joe Biden said that the Trump administration’s refusal to authorize the start of the official transition process “does not in any way change the dynamic of what we’re able to do.” Lawyers working to reunite migrant families separated by the Trump administration before and during its "zero tolerance" policy at the border now believe the number of separated children for whom they have not been able to find parents is 666, higher than they told a federal judge last month, according to an email obtained by NBC News. Plus, veteran homebuyers and Beyoncé’s partnership with Peloton.