How many bikes do you own?

There's simply no way of providing proof for that. I hate poorly researched maths programs.
No one area can lay claim to having invented zero. Let alone one country.

It was actually the first appearance of a mathematical symbol for zero rather than the concept of. Not sure it was badly researched, probably considerably simplified, this was the series...

[ame]http://en.wikipedia.org/wiki/The_Story_of_Maths[/ame]