Well, someone quite handily edited my post...
As to the "why humans aren't evolving now", what evidence do you have that evolution has stopped? Do you expect humans to sponteanously morph into birds over a fortnight?
I'm sorry, friend who edited my post, but evolution is not a fast process by any stretch and humans are beyond natural selection to an extent because of the size of our civilisation now which makes selective pressures rare given we don't suffer predation, have vast amounts of technology and are in large abundance.