Camp Inquire students watch as a small metal ball makes its way along the track of their experimental invention during "Crazy Contraptions" class on Thursday in St. Henry. The ball eventually initiated a toy car that finished the track while bursting a balloon with a nail fixed to its bumper. Teacher John Dorner led the class. More than 500 students from 15 area schools are attending this year's Camp Inquire program, which lasts four weeks. Classes are held two weeks in St. Henry and two weeks in Celina. The program offers eight topics for youths in second-to-sixth grade. It is the 31st year for the program, according to director Brad Green.