My mother thinks that in like 100 years or something , our thumbs will become bigger because we use smartphones. I tried to explain to her, that according to evolution by natural selection, this wouldn’t happen, because not only this situation doesn’t come with any advantages, it may even cause disadvantages. A bigger thumb/hand means more energy consumed in a situation that isn’t needed. But according to my mom, using screens will affect our hands. She even sent me some articles about this subject, and I am shocked that some biologists say that this is possible, is there something that I am missing?