Congratulations to this week's winners:
Kyle Ambroso, Mundia Mubyana, Ray
Kremer
From outside Bradley University, correct solutions were submitted by
Monty Gray, Bill Webb, Michael Morrison, Burkart Venzke, Philippe Fondanaiche,
and one other correspondent.
There are several ways to interpret the problem.
The most common solution involves putting the four brothers at the vertices
of a regular tetrahedron inscribed in the sphere of the earth. This
solution is mimicked in nature by the arrangement of four hydrogen atoms
surrounding a carbon atom in a molecule of methane.
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ã2000 Alberto L. Delgado