Valentine's Day is all about the hearts: heart-shaped chocolates, cards, balloons and even pizza. But the heart hasn't always just been a symbol of romance. Across cultures and centuries, the heart ...

They are plastered all over candy and billboards. They're everywhere on social media and throughout pop culture. From jewelry to emojis, the heart icon has symbolized love for centuries. But why?

In this video, Mikhail Varshavski, DO -- who goes by "Dr. Mike" on social media -- gives a history lesson on the heart, including cultural depictions and the evolution of our understanding of anatomy.

Why do we draw hearts that look nothing like an actual heart? Why do we think that love comes from the heart if our feelings actually come from our brain? Let's find out! But Why – A show for curious ...

Michelle Spear does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...