The quality of our tools affects our ability to perform and affects our sucess in our in the real world.
Cultural and biological evolution are intimately intertwined.
One example, we eat much better than our ancstors.
As a result, average height, weight and longevity are increased.
Culture affects biology.

And what would you call the cybernetic creatures we are aleady evolving into?
Cell phones and other devices, instant access to the web and all its supplemental information?
No we are changing, physically, mentally, and socially.

And its a constant.

Some species seem unchanging.
A good example would be yellow perch in Europe and North America.
So little divergence there (one extra spine on the dorsal fin of the European variant) that they can readily interbred.
Yet they were seperated since the time the two continent touched.

In that same time span, two hominid species bred back into Homo Sapiens (or disappeared).
We just happen to be one of the more changable species.

Remember its not just natural selection and cultural evolution.
There's also random genetic drift, mutation, and population mating structures influencing evolution(although the last could be lumped in with culture)

Personally, I coming to believe that evolution may be more proactive then previously thought.
That oganisms change in order to better suit their habitats.
Not selected, change suited to improve.