For no reason at all, the word Australopithecus keeps popping into my head. I didn’t really know what an Australopithecus was, but it didn’t stop it from invading my head. I googled it, and found out that it’s a family of upright-walking primates that may be our evolutionary ancestors. They lived in East and South Africa around 4 million years ago.  I wonder why I kept thinking that word?