I really don't know who invented the concept of Zero and decimal system. But what I read here is absoluely amusing. Someone here has the notion that John Napier (16th century mathematician) invented the Decimal system! Thats absolutely hilarious! Napier and logarithm fine..."Napier's bones" ok
but decimal system which is being used for more than 2000 years invented by Napier! This is too much!

His most famous discovery "the Napiers bones" is based on the Chinese Abacus which the Chinese discovered may be 3000 years ago. But Napier became famous in Europe when he rediscovered the old Chinese method of calculation!