## Planar graphs## by A. Y. OlshanskyConnecting points on a plane without intersections can be tricky—just ask an electric circuit designer. A consideration of the implications and applications of planar topology. ## Waves beneath the waves## by L. Brekhovskikh and V. KurtepovAnomalies in the ocean’s temperature and salinity create underwater pathways through which sound can travel over long distances. Learn why the pathways exist and why they are a good oceanographic tool. ## The gambler, the aesthete, and St. Pete## by Leon TaylorHow much would you stake on a bet with an infinite possible payoff? ## Departments## Gradus Ad Parnassum: Variations on a Theme## by Mark Saul and Titu Andreescu
## Kaleidoscope: Molecular IntrigueSurprising facts and thought-provoking questions about particles at the atomic level. ## Looking Back: The Lunes of Hippocrates## by V. N. BerezinInteresting by-products of a Grecian attempt at squaring the circle. ## Physics Contest: Local Fields Forever## by Arthur Eisenkraft and Larry D. KirkpatrickThe vector sum of gravitational fields is something we can actually sense. ## At the Blackboard: Incandescent Bulbs## by D. C. Agrawal and V. J. MenonThe intense heat generated by lightbulbs is not just a filament of your imagination. ## At the Blackboard II: Constructing Quadratic Equations## by A. A. PresmanPut away your calculator and grab your compass and straightedge. ## Cowculations: Gingerbread Man## by Dr. MuDr. Mu’s trusty computer cranks out some holiday cookies. ## In the Lab: Hyperbolic Tension## by I. I. VorobyovRelax. Measuring surface tension is not as hard as you think. ## How Do You Figure?: Challenges in Physics and Math## Brainteasers: Just for the Fun of It!## Happenings: Bulletin Board## Crisscross ScienceScientific crossword puzzle. ## Answers, Hints & Solutions
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