Many scientists used to believe that human beings came from Africa  But scientists have recently found fossils of four species of early primates in the Sahara Desert of Africa  These species may have lived 39 million years ago, but they are different from those living in Africa at the same time or earlier  This suggests that they arrived in Africa after evolution elsewhere
It takes a long time to evolve into these four early primate species, but there are no signs of evolution in Africa.
 Scientists believe that the most likely explanation is that these species originated in Asia and then migrated from Asia to Africa