How did Cavemen help invent NERF toys?

Why is NERF called... NERF? What is NERF made of? What NERF toy helped turn NERF into one of the biggest toy brands ever? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.