The sun clearly does have a causal relationship with traffic, as traffic is exclusively the product of humans who are not sleeping, and is powered by the decaye

The sun clearly does have a causal relationship with traffic, as traffic is exclusively the product of humans who are not sleeping, and is powered by the decayed products of photosynthesis. You may wish to choose a better example. Also the study is apparently proposing that natural selection is favoring low educational achievement. This, not incidentally, is the fundamental premise of the movie Idiocracy, and certainly has a plausible logic to it, though I am wholly unqualified to judge the methodology of this study.