Bounce!

Ever wondered what makes rubber bounce? Or why it's stretchy? And WHY is rubber so . . . rubbery?! Learn the facinating science and history behind this ubiquitous material!With sidebars, graphics, fun facts, and more, the history of rubber reveals plenty of fascinating secrets and surprises. Elementary school readers will discover that early balls didn't bounce; that people in the rainforest made waterproof gear from rubber thousands of years before Europeans got into the act; and that sneakers, bicycles, and cars created demand for more and more rubber!Back matter includes a time line and a bit about the complicated implications of harvesting rubber.