Coronavirus social bubbles might pop this winter. Here's why small gatherings aren't as safe as you may think.

Wearing masks indoors can mitigate the risk of small gatherings.
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Small gatherings are an increasingly common setting for coronavirus transmission.
If you're going to gather indoors, maintain a small and strict bubble and don't be afraid to ask the hard questions.
Holiday celebrations and cold weather may pose challenges to bubbles, so it's important to practice safety measures such as social distancing and mask-wearing.
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