It is considered that modern humans appeared 100000 years ago. However, for a very long period of time, their life remained almost unchanged, with a very slight development of their lifestyle. Nevertheless, all of a sudden archeologists started to find some fossils dated to 40000 years ago and which served as evidence of a great change in the life of people. This change was called the Upper Paleolithic Revolution. However, some finds of fossils associated with Neanderthals can change this idea, as they show some inconsistency it dating.