Exercise: try to square the notion of "intelligent design" with the maladaptation of the modern kidney:

"The kidneys do an incredible job of holding on to sodium, which was important to the survival of our early ancestors who lived in a salt-poor world, but today there's so much salt in the food we eat that the kidneys end up holding onto too much sodium," and that can lead to high blood pressure, researcher Dr. Howard Pratt said in a prepared statement.