How Do Dinosaurs Eat Their Food? (+ Audio CD)

As people of different ethnic backgrounds, or religions, or races drink different amounts, it follows that people who drink different amounts will differ in ethnic background, in religion, and in race. One can speculate about thousands of ways in which drinkers could differ from teetotallers, and if one actually examined two such groups, one would find a few dimensions on which such extraneous differences were large, several dimensions on which such extraneous differences were moderate, and a large number of dimensions on which such extraneous differences were present but small. The hurdle that the correlational researcher is never able to overleap is that given that he is unable to look for every conceivable difference, he will never know all the ways in which his naturally-constituted groups did indeed differ from each other. Natural groups may eat different amounts of broccoli. And so then, no cause-effect conclusion will ever be possible from a correlational study. If the moderate drinkers happen to live longer, we will never be able to conclude that this is caused by their moderate drinking, because it might be caused by how close they live to high-voltage lines or how often they wash their hands or how far they drive to work or how much toothpaste they swallow or how much they salt their food or how close they sit to their televisions or how many pets they keep or whether they sleep with their windows open or whether they finish their broccoli ...»