Human Evolution Diagrams

I try to put at least one image into every blog post I upload. While Googling pictures of the evolution of humanity – you know, the one that starts on the left with Australopithecus afarensis or whatever and builds towards a modern man on the right – I found quite a few variations on the theme. Some of them made me smile, so I thought I'd post them here. Enjoy!

By the way, do you know who designed the original version of this diagram?

UPDATE: I've been informed that the diagram is Rudolph Zallinger's March of Progress. Thanks, Simon!