Science & Mathematics Puzzles
AIMS Education Foundation
Bilkent University Problem of the Month
Bradley University Problem of the Week
Brian White's Science Puzzles
Columbus State University - Problem of the Week Contest
Dansmath Problem of the Week
Forest Puzzles
IBM Ponder This
John Handley High School Problem of the Week
Ken Duisenberg's Puzzle of the Week
Mathematics Problem Solving Task Centres
Math Forum: Problems of the Week
Math Forum: Geometry Problem of the Week
Math Forum: Algebra Problem of the Week
Math Forum: Math Fundamentals Problem of the Week
Math Forum: Discrete Math Problems of the Week
Macalester College Problem of the Week
Math Magic
Purdue University Problem of the Week
PuzzleUp
Pzzls - Math
Pzzls - Science
Science Crossword Puzzles
Science News for Kids - Puzzle Zone
Science Spot
Science University - Tetrahedral puzzles
Trent University Problem of the Week
University of Regina Monthly Problem
Wabash College Problem of the Fortnight
White House Math Challenge
UPCOMING EVENTS
December 9, 2009: High School Protein Modeling Challenge
December 15, 2009: Deadline for undergraduate MARC program fellowships