The Eyes Have It
Evolutionists have always been nonplussed by the evidence for complex adaptation in biology. In the 20th century evolutionists tried to show that random mutations could bring about evolutionary change. Not only did they spectacularly fail, but in the process they stumbled upon evidence for profound adaptation. Here is how evolutionist Julian Huxley described one example in his 1953 book Evolution in Action:
Finally, we have the curious fact that the harmful effects of mutant genes may automatically be selected back toward normality. For instance, the so called the eyeless mutant of the famous fruit fly, Drosophila, at its first appearance had no or small eyes and was less healthy and in general less capable of survival than normal wild-type of flies. But after a pure eyeless strain had been bred for eight or ten generations, both its health and vigor and it’s eyes were almost normal. Any odd mutant genes already present in small numbers in the strain, which reduced the harmful effects of the eyeless mutation, automatically multiplied at the expense of those which did not. Natural selection, in fact, provided a genetic servo-mechanism to regulate the mutant back toward normality in its effect. 
Yes it was a curious fact. And it could have been used to learn more about adaptation. But under evolution it was viewed as just another product of natural selection. It is another example of how evolution is not vulnerable to scientific findings.