In this Feb. 24, 2017 photo, Starke Primary School students in Pekin, Ill., react as a hydrogen balloon is ignited and other demonstrations by the Demo Crew, which is composed of students from Bradley University's Chemistry Club. Led by chemistry professor Dean Campbell, the program has been presented for more than 20,000 people, primarily middle school students to share an appreciation of science.(Fred Zwicky/Journal Star via AP)
Featured Photo Galleries
