TIME ABOUT A million and a half years ago, some forgotten genius of the hominidworld did an unexpected thing. He (or very possibly she) took one stone and carefully used itto shape another. The result was a simple teardrop-shaped hand axe, but it was the world’sfirst piece of advanced technology.

It was so superior to existing tools that soon others were following the inventor’s lead andmaking hand axes of their own. Eventually whole societies existed that seemed to do littleelse. “They made them in the thousands,” says Ian Tattersall. “There are some places inAfrica where you literally can’t move without stepping on them. It’s strange because they arequite intensive objects to make. It was as if they made them for the sheer pleasure of it.”

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