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        Part of It's Okay To Be Smart
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        How Many Heartbeats Do We Get? | It's Okay to Be Smart | PBS Digital Studios

        Ever wonder how the heart symbol came to stand for the actual heart? And why do we speak of the heart as the seat of love, when love really happens in our brains? Is it true that animals only get a billion heartbeats? This week, we give you enough cool cardiac science to make your heart skip a beat

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