Challenge your grandkids Straw launched paper jetDownload Engineering challengesDownload Build a bridgeDownload Index card towerDownload LaunchersDownload boomerangs and balloon cup shootersDownload Check out the section in Pintrests’s whyjet/activity-kits/challenge-your-grandkids Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Like this:Like Loading...