/r/askscience
Do animals that mate for life (eg. Penguins, beavers, etc.) sleep around a bit before mating for life or do they just spend the rest of their lives with the first one they mate with?
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AskScience AMA Series: I am Dr. Saad Omer and I'm here to talk about vaccines and the diseases they prevent. Ask Me Anything!
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If someone has been muscular in the past, does he gain muscle mass more easily as someone who has not gained muscle before?
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