[zeestephen]

Re: 4,000 years old

Kind of amazing that 3,500 years later, the indigenous people of North and South America still had not discovered the wheel or developed a common form of math and written language.

[SunkenCiv]

Yeah.

[Reily]

I've heard that explained in the following fashion.

In North America with no draft animals larger than a dog why have a wheel.

In South America with no draft animal larger than a llama coupled with the Andean terrain again why have a wheel.

Though the concept was there. There were Aztec, Mayan & I believe Incan children's toys with wheels.