Quote from bwolinsky:
I'll start with, how many years did it take to go from neodrathal to modern humans? Try a good 50 million years. By 10 million BC we had modern humans. So, we can expect some quantum leap in human intelligence in 40 million AD if we're still around.
Quote from jficquette:
Point is natual selection has only had 100 years to work with humans who have lived longer then 40 years on average.
I suppose you guys just made up those numbers. As has been said, modern humans only appeared 100,000-200,000 years ago.
Humans living only 40 years? Life expectancy at birth comparisons are completely flawed due to the improvements made in the modern era regarding child mortality and death during childbirth. The life expectancy for someone who reaches adulthood has always been far better.
Also factor in that people these days marry later and often divorce.