Who invented rubber balls?

Answer 1

You need to define the answer. Foam can be confused with bubblly foam (like in the bath, doing the dishes) and then there is Polyurethane foam, what people use as padding for insulation.

For Polyurethane foam information, seek out this information from this eHow website:

http://www.ehow.com/about_4673650_history-polyurethane-foam.html

Answer 2

The Mayan invented the rubber ball.