Why Men Have Nipples, in One Colorful Animated Video
A short by AsapSCIENCE explains that both men and women are "female" in the first stage of human development.

AsapSCIENCE
On the heels of this week's launch of my yearlong project celebrating history's trailblazing women and this recent meditation on how to be a woman comes this illustrated scientific explanation of why we all begin our lives as females, biologically speaking.
AsapSCIENCE have previously covered the science of productivity, what alcohol does to your brain, why we blush, the science of lucid dreaming, how music enchants the brain, and the neurobiology of orgasms.
This post also appears on Brain Pickings, an Atlantic partner site.