Thanks, that is quite interesting, but I was already aware. So let's not confuse which culture invents with which culture consumes. Also should add the stirrup,

Thanks, that is quite interesting, but I was already aware. So let's not confuse which culture invents with which culture consumes. Also should add the stirrup, paper, hand guns, and using petroleum as fuel. I wonder if any of these IP thefts could be successfully litigated, and if so, what the result would be.