School kids playing with an air cannon at a science centre

indoors day four people kids children girls boys schoolchildren school kids schoolgirls schoolboys african american ethnicity black caucasian chinese ethnicity multi-ethnic group classmates science centre laboratory childhood exhibit museum education learning experiment pushing pumping aiming turning standing science knowledge discovery curiosity excited surprised facial expression playing playful air cannon plastic barrel blowing air fun smiling laughing running school uniform long hair ponytail short hair three quarter length handheld