What if there were not a fast or effective way to get rid of sewage waste? The world would be a pretty disgusting place.

The more that is known about the human body, the more amazing its construction turns out to be. A recent New York Times article focused on eyeball optimization: "[The] basic building blocks of human eyesight turn out to be practically perfect."¹

Early in the 20th century, brilliant chemists generated pharmaceuticals in laboratories. But the cost/reward ratio of painstaking lab experiments turned out to be far greater than the cost/reward ratio of extracting chemicals from living things. It turns out that the chemists were not doing nearly as good a job at providing effective drugs as God already had through nature.

An animal wouldn't grow larger than an insect without specialized equipment designed to transport oxygen to and carbon dioxide from cells deep inside its body. Fortunately, thousands of different animal kinds have been outfitted with tiny machines called hemoglobins that directly and specifically interact with individual oxygen molecules, making larger body sizes possible.