I brought it up because it was performed using questionable methods, not fully disclaimed, and because it became a big natural selection bugaboo to creationists. As I brought up, and not fully understood, HIS results were never replicated in a way that would confirm his first experiment. Now people, propelled by hot gasses exiting the ear rather than slow thoughtful processes, jump to the rescue “shouting” “oh yes it has”, oh yes it was “. etc. But no, it wasn’t and hasn’t. What WAS done was his experiment was tried using CORRECT methods and measurements without any manipulation of the results or modification of the experiment while in process. It was THESE procedures, and not failed attempts at repeating the error filled experiments Kettlewell performed, that achieved some correct and significant results. So my statement still stands. No one has repeated his exact experiment and recapitulated his original results.