What makes water beading?

Chemistry Level 1

The above is a photograph of water beading on a leaf (photo taken by Michael Apel). Water adheres weakly to waxy surface such as a leaf and strongly to itself, so water clusters into drops. Surface tension gives them their near-spherical shape, because a sphere has the smallest possible surface area to volume ratio. The surface tension of water is higher than most of other materials. What best explains this high surface tension of water?

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