It was the aliens they spliced together dna from a chimpanzee and themselves and created a relatively dumb subservient slave. there is actual evidence that our brains originally were all 1 and not in 2 halves this is the genetic alteration get our brains back together without the 2 halves and we will be like the creator the aliens, but only marginally so because remember we our 98.6 percent chimpanzee.