Arthur C Clarke commenting on Stonehenge said that it showed that if a baby born in the Stone Age was transported through time and brought up in present day he would be quite capable of being an astronaut.
Obviously

The same can't be said of Neandethals with whom our species lived along side for 100,000 years, in fact researchers now believe that we cross bred with them & that around 2% of our genetic make up is neanderthalian..................the percentage may be a little higher around where I live though
