TED Talks
Ted: Ted Ed: Can You Solve the Famously Difficult Green Eyed Logic Puzzle?
One hundred green-eyed logicians have been imprisoned on an island by a mad dictator. Their only hope for freedom lies in the answer to one famously difficult logic puzzle. Can you solve it? Alex Gendler walks us through this green-eyed...
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Nz Maths Problem Solving Lesson Plans: Level 4
This New Zealand Problem Solving website is an outstanding resource for lesson plans. They are organized into the following categories: algebra, geometry, measurement, numbers, statistics, and logic and reasoning.