The Sumerians had the abacus (2700BC), the Greeks, the Romans, the Chinese, etc, etc, etc. Why credit it to this Gerbert guy? Reference: http://en.wikipedia.o

The Sumerians had the abacus (2700BC), the Greeks, the Romans, the Chinese, etc, etc, etc. Why credit it to this Gerbert guy? Reference: http://en.wikipedia.org/wiki/Abacus http://en.wikipedia.org/wiki/Abacus