# Category Archives: Puzzles

Consider the Liar sentence ‘This very sentence is false’. Is it true, false, neither or both? From Wikipedia: Liar’s Paradox This video is part of a series of work by High Tech High Media Arts 12th grade students in the … Continue reading

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## How Old is Grandma?

The answer – if you guess right – will blow you away. One evening a grandson was talking to his grandmother about current events. The grandson asked his grandmother what she thought about the shootings at schools, the computer age, … Continue reading

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## My Collection of Favorite Fun Puzzles for All (Part Two)

#8: This is a multi-level rolling block maze with the following rules: 1. Each of the dark blocks (A, B, and C) can roll in any one of four directions, using one of its base edges as the axis of … Continue reading

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## My Collection of Favorite Fun Puzzles for All (Part One)

#1: Place the numbers 1 through 10 (each used exactly once) into the circles so that each pair of consecutive circles is farther way than the last pair. #2: In a certain country, it takes a minimum of 5 coins … Continue reading

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## Balinese cup trick / candle trick / spinor demonstration

What’s the simplest explanation for this trick? How does this trick relate to the spin-statistics theorem? “It’s the Balinese candle-dance trick, and if you don’t know it, go find someone who can show you how to do it. You hold … Continue reading

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## Prime or not Prime?

And, what’s the nearest prime number? The number 90506 The US Debt Clock

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## Playful Thoughts With Richard Feynman’s Puzzles

I like Richard Feynman’s puzzles, because they are easy to state and understand, they give lots of food for thought, and they can be hard to solve. Try to solve each of the following puzzles on your own first, then … Continue reading