Do you think we're actually more advanced than our ancestors? Remember the Egyptians and Mayans built pyraminds with precisely cut stones, only in this modern age have we been able to achieve such a feat. While our ancestors may have lived a simpler life, that does not mean they were less intelligent, they had to do more with less, they actually had to think, which 90% of the world's population doesn't or has lost the ability to do, because thinking is hard, people have computers read books to them, people make music on the computer instead of playing an instrument, people have a computer do calculations for them that they either never could or are too lazy to do... quite simply computers are the catalyst of the rampant degeneration of the human race's intelligence, but that's not the point here. My point is that our ancestors were quite intelligent and figured out ways to create great things with a lot of hard work and little technology.