eli5: Why drops of water always form a circle/half ball shape?

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Even if you move it with a pencil it goes back to its original shape

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Water has an invisible skin called “surface tension”. Think about what a partially filled water balloon would look like, and act, just sitting there. That’s what the water droplets are doing because of their surface tension. In essence, droplets of water are little water balloons that haven’t popped.

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