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If a heart is a muscle, why doesn’t it ever get tired of beating but things like my arms and legs do?

19273 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If a heart is a muscle, why doesn’t it ever get tired of beating but things like my arms and legs do?	19273
If I see a bee, does that technically mean there’s a beehive somewhere nearby?	1