According to Greek mythology, humans were originally created with 4 arms, 4 legs, & a head with 2 faces. Fearing their power, Zeus split them into two separate parts, condemning them to spend their lives in search of their other halves. How adorable is this cartoon.
Modern day Greek myths (I don't agree with the textbook one. Yeah it's a scam, but doing that actually hurts genuine scholars trying to publish their research, not hurt an industry taking advantage of things. The same thing happens with music. It's a vicious cycle that nobody wins except the ones doing the exploiting)