Did you know that if you blow a soap bubble into air that is below a temperature of -15⁰C (5⁰F), they will freeze when they touch a surface? At -25⁰C (-13⁰F) the bubble will freeze in the air and could shatter when it hits the ground. The frozen bubbles work better if you wave a bubble ring through the air instead of using warm air from your mouth. Or perhaps you are looking for a circle badge to help separate your groups? 

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