What makes us human? According to Stanley Kubrick's 2001: A Space Odyssey, it's our ability to use tools that separate us from our simian ancestors. In his sci-fi epic, Kubrick boils down the entire story of humankind from its inception as apes, discovering how to utilize tools to overpower their natural enemies, all the way to humanity's inevitable rebirth, deep into the space age. However, scientists have long since decided that this theory about the cornerstone of human civilization is false.