Tuscaloosa area middle school sixth graders compete in a rocketry challenge at Hillcrest High School Friday, April 8, 2016. Andrew Scott, a Hillcrest Middle School student, launches his rocket. The rocketry program is sponsored by the University of Alabama’s engineering school and students from UA worked with the sixth graders to teach them the principles of rocketry and help them build their models. The water rockets were propelled by pumping 75 psi of air into the partially filled bottles and then pulling a launch cord. Sources: WVUA 23, The Tuscaloosa News