In 1970, the natural history illustrator Rudolph Zallinger painted a picture of human evolution called "The March of Progress" in which a parade of hominids walked along from left to right, evolving from knuckle-walking ape to tall, spear-carrying Cro-Magnon. The picture is etched in our collective consciousness, making it possible for cartoonists to draw pictures like the one here safe in the knowledge that we'll all get the joke. I had actually wanted to show Zallinger's own picture, but, like others before me, I failed to find it on the web. I was inspired to hunt down the picture by the news today of the discovery of a strange new fossil of a hominid--an extinct relative of humans--that lived 900,000 years ago.
Zallinger painted "The March of Progress" at a time when paleoanthropologists still had found only a few hominid species. When most experts looked the evidence, it seemed reasonable ...
