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New research suggests there may be biological reasons that we are at a significantly increased risk of getting sick when temperatures drop.
Scientists show how cold weather makes you sick, NOVA
Cold Weather Affects Our Bodies in Surprising Ways
Special Savings The science behind making snow - Men's Journal, snow making machine
Can humans hibernate too? Why do people get more sick in the winter? - Quora
Can a quick change in weather make me sick?
The Science & Use of Cold Exposure for Health & Performance
Science Reveals Why Don't We Get Sick In The Summer - AskMen
RSV Vaccines Are Finally Here after Decades of False Starts
Yes, You Really Can Be Allergic To Cold Weather