There have been clawed hammers since at least 1514: http://en.wikipedia.org/wiki/Claw_hammer http://en.wikipedia.org/wiki/Claw_hammer Clearly, innovation is go

There have been clawed hammers since at least 1514: http://en.wikipedia.org/wiki/Claw_hammer http://en.wikipedia.org/wiki/Claw_hammer Clearly, innovation is good - the modern (1514) hammer is better than the big stone our Homo Abilis ancestors used. But at some point, you reach an upper bound.