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Why we get sick more in winter: cold, dry air, and indoor time
What research says about why respiratory infections rise in the cold season: dry air, a cooler nose, crowded indoor days, and which findings come only from animals and cells.
Does getting cold give you a cold? What a chill can and can't do
A chill cannot create a virus, but some studies link a drop in temperature with more colds. What each study measured, how reliable it is, and what nobody knows yet.