Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
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People Bingo is secretly on of my favorite ice breakers to do in a classroom. It makes the students talk to each other and learn more about each other. It's an activity and it could possibly lead to new friendships!