Of course our brains are evolving. Evolution doesn't just stop at the present. Eventually everyone writing on slashdot will be viewed as "monkeys" and religious fanatics of the future will proclaim that they did not evolve from these neanderthals.
If you push the "extra ice" button on the soft drink vending machine, you won't get any ice. If you push the "no ice" button, you'll get ice, but no cup.