/r/askscience
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How do those little winter birds, like chickadees, not freeze to death, and, if they are just little well-insulated furnaces, where does all their energy come from, just seeds?
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AskScience AMA Series: Hi, Reddit! I'm a critical care-related researcher, professor of medicine and doctor in the ICU. AMA about wellness, burnout and PTSD in healthcare professionals!
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