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I made this Handy Hand which imitates ligaments and moves by pulling strings.
We explored the properties of bubbles. We made a bubble inside a bubble and demonstrated that air takes up space by blowing air into a bubble and seeing the bubble expand. We saw that bubbles are always round because the air inside them pushes against the surface tension of the bubble with equal force in all directions and we also saw that water bubbles burst when they dry out.
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