He conducts a study of 75 hundred men from five different countries. He tests three methods for measuring body fat. One is water displacement, where they fully just like submerge you in a tank of water and see fresh water you've displaced. Another one is skinfold tests,. We wer get out those big calipers and measure the skinfolds. It's better to reserve those for children in front of all their peers. In doctor's offices. De that's not let's not do that. So he draws his subjects from predominantly white nations. And he does note this in the study, that while he had participation in south africa from bonto men, so men from the b