coin flip trick
This is a “rounds” trick for deciding who buys the round when you’re drinking with two friends. You won’t win all the time, but your drinks bill will be cut by 25%. You’ll need an accomplice and a...
View Articlecouple of globe puzzles
I was thinking about the Earth on the way to work today. Here are a few puzzles I compiled on the way: you are standing an the north pole. you travel 8000 miles south, then 8000 miles east, then 8000...
View Articlemonty hall – how it works
I was lying in bed last night, wondering how the Monty Hall trick works, and finally figured it out by twisting around my perception of the problem. What is the Monty Hall problem? Consider three...
View Articleformula for figuring out keys
I was just looking at scales and trying to memorise how many sharps and flats each key has. In short: count the sharps. multiply by 7. divide by 12. add the remainder in semi-tones to C. that’s the...
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