An 18-year old is dead and his 17-year old friend hospitalized when their propane-propelled model rocket exploded at an elementary school Monday evening. The two high school students from Thousand Oaks, California, were working to test launch the model rocket as a school project Monday evening on the handball courts of Madrona Elementary School when it exploded. Witnesses nearby heard the explosion and were quoted saying that it sounded like a sonic boom.