The Great Balloon Pop! Your mission: build a balloon powered device with enough oomph to pop another balloon 40 feet away! Prizes will be awarded for the first exploded balloon and for the most creative craft! Teens entering grades 9-12 can compete individually or as a small group. Teams are encouraged, so bring you friends! Snacks and supplies provided by the library. Water-balloon games will follow the challenge, so come ready to get soaked!