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https://www.youtube.com/watch?v=bYkY4Yig3Gk This quirky animated video from AsapSCIENCE explains the science of breasts in an entertaining way. The narrater answers questions like: "Why is one often bigger than the other?" (and why it's the left one), and "Why is breast cancer one of the most prevalent cancers in America?" (and why it's on the increase). MORE: 10 tips to help you lower your risk of getting breast cancer The video also briefly explains other curiosities like why we love our breasts (even men), and how breastfeeding works. MORE: Why breast cancer is such a common disease