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The vaccine from these freezers and pack them into thermal boxes loaded with dry ice. the 2.9 million doses in the first batch of the vaccine will be rolling out of this facility on trucks around the clock the moment pfizer gets the green light. much of it headed to airports. fedex taking the west, u.p.s. taking the east, to reach all 50 states within 48 hours. each box tracked every step of the way. >> this is a gps tracker that also gives temperature. it gives light exposure and motion. >> reporter: u.p.s. already shipping out thousands of vaccine kits with syringes and ppe. health care work...

Environmental medicine." researchers compared over 1,100 breast cancer patients with a like number of women who have no history of breast cancer. about a third of the women worked at jobs where they spend at least half their time on evening or night shifts. the breast cancer risk was more than twice as high for women with 30 years or more of night shift work. in this study the risk was even higher for women in health occupations. scientists suspect that it may involve melatonin which regulates daily body rhythms. and they think increased light exposure on night shifts may depress melatonin pro...

Environmental medicine." researchers compared over 1,100 breast cancer patients with a like number of women who have no history of breast cancer. about a third of the women worked at jobs where they spend at least half their time on evening or night shifts. the breast cancer risk was more than twice as high for women with 30 years or more of night shift work. in this study the risk was even higher for women in health occupations. scientists suspect that it may involve melatonin which regulates daily body rhythms. and they think increased light exposure on night shifts may depress melatonin pro...