How the heart became ♥

The heart symbol has made its way into our daily lives. It's in our emoji, our Valentine's Day cards, and our chocolates. It even caused an uproar in November when Twitter changed its "favorite" button to a "like" button, replacing the star symbol with a ruby red heart. But why doesn't it look like the real thing?

Zachary Crockett at Priceonomics has looked into the history of the symbol. To learn about how the ♥ evolved over thousands of years, watch above. You can get more videos like these by subscribing to the Vox YouTube channel.