The thing is we are always evolving, for example "Increased Intelligence" Think about it this way, In GCSEs, A Levels, Degrees etc. there are boards in charge of these exams, who make the tests harder every year or so, believing them to be too easy as many people pass or do well on them, however it could be that we as a species are evolving with higher intellects, I'm not saying in forty years time our children will all be little Einsteins, what I'm saying is that our capacity for knowledge is slowly growing, as to your Australian Aborigines comment, I've read of people who because of the environment they live in they hearing is so acute they can literally hear a leaf drop this maybe purely environmental or it could be genetic, also there are people who get hunches, who can read people not psychics, read them as in tell what kind of person they are, I'm sure all of you at some point have done something which has made you think, like the old example knowing the phone will ring before it does or who it is before you answer, perhaps this is just dumb luck or latent genes beginning to activate in our species I'm not saying that well all become x-men style mutants, however were already mutants, all humans are mutants, we all have a mutant genes, not all are active, and they're not genes that allow people to have telekinesis they're genes that affect hair colour, eye colour, skin colour etc. I myself have a mutant gene which means my eyes are two colours both are brown around the pupil and green on the outer edge, I've traced this trait back to my great grandparents. In conclusion it's very possible that we are evolving or these are all environmental factors which can't explain all of these