Massachusetts December 2, 2020 3:49 pm Mass. Company Builds Ultra-Cold Freezers to Store COVID Vaccine Pfizer’s coronavirus vaccine must be stored at extremely cold temperatures, a logistical problem a Waltham company is working to solve. US & World Videos 3:13 Weather forecast: Clear and sunny, with temps in the 70s 1:29 Sumner Tunnel in Boston to close for one month 2:17 Police testimony continues in Karen Read murder trial 2:03 Mass. school officials threaten to suspend student protesters 2:13 Karen Read trial Day 6: Witness testimony resumes