Things to Make and Do in the Fourth Dimension cover
Things to Make and Do in the Fourth Dimension
by Matt Parker
Description: Things to Make and Do in the Fourth Dimension presents puzzles, games, and activities designed to introduce readers to mathematical concepts and logical thinking beyond basic levels, aiming to make abstract ideas more approachable
ISBN: 0374535639
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Jun8 · 2021-11-30 · Original thread
Here's a much better party/bar trick:

  1. Point to the drink glass in front of you   2. Ask friend if they think the circumference or height of the glass is larger   3. Friend will invariably think that height is larger   4. Wager for a drink that that's not the case   5. Use a straw to measure the circumference and then height   6. Enjoy your free drink
Unless you've picked an a Champaigne flute you'll always win. To make it even more fun, for (4) wager that the circumference will be two times the height to make it sound more incredulous. For typical glasses you may go up to three!

I learned this trick from Things to Make and Do in the Fourth Dimension (https://www.amazon.com/Things-Make-Fourth-Dimension-Mathemat...), overall good book.