Yup, read that too. I had a discussion with my son( Dr blam) at Christmas.
I proposed to him that humans are evolving daily to comprehend pollution and all the other things that we're worried about these days. The 'selectivity' is occuring at the egg/sperm interface and post fertilization spontaneous abortions. If the mother's body is polluted, only the unions that can withstand the pollution will survive to birth. So...we're having births of stronger humans daily.
I don't think so. You are forgetting modern medical science. The infant mortality rate in the 1st world is a fraction of what it used to be only 100 years ago. I have an older brother who is afflicted with allergies of all types and was a sickly baby. We joke with him that if he had been born in 1900 he would never have lived past 5 years old and that is probably the truth. In any case we have far more humans that would have died in childhood but who are alive and passing on their genes to other generations. I think the result is that we have "less strong" genes overall than we did just 100 years ago.