How did the human heart become associated with love? And how did it turn into the shape we know today?

We see the familiar symbol everywhere -- in text messages, signs, cakes, clothing, and more. But we also know the real heart looks nothing like it. Historian Marilyn Yalom tells us how the anatomical organ became the symbol that we all know today.

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How did the human heart become associated with love? And how did it turn into the shape we know today?

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