What space-filling arrangement of similar polyhedral cells of equal volume has minimal surface Area? Kelvin proposed the 14-sided Truncated Octahedron. Wearie and Phelan (1994) discovered another 14-sided Polyhedron that has 3% less Surface Area.

**References**

Gray, J. ``Parsimonious Polyhedra.'' *Nature* **367**, 598-599, 1994.

Wearie, D. and Phelan, R. ``A Counter-Example to Kelvin's Conjecture on Minimal Surfaces.''
*Philos. Mag. Let.* **69**, 107-110, 1994.

© 1996-9

1999-05-26