1. Cut off both ends of a quart-size milk carton. This will be your bubble wand.
2. Ask your friends what shape your bubble will be. They will probably guess “square!”
3. Dip one end of the carton into the bubble solution, and gently blow into the other end. Watch your friends’ surprise when they see a round bubble!

Behind the magic: All bubbles are round, regardless of the shape of the bubble maker. They try to pull themselves into the shape that has the smallest surface area, which is a sphere.

 

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