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http://www.exploratorium.edu/ronh/bubbles/bubbles.html
by Ron Hipschman.
What is so fascinating about bubbles? The precise
spherical shape, the incredibly fragile nature of the
microscopically thin soap film, the beautiful colors that
swirl and shimmer, or most likely, a combination of all
these phenomena? Why does a bubble form a sphere at all? Why
not a cube, tetrahedron, or other geometrical figure? Let's
look at the forces that mold bubbles.
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