A magic store sells truth-telling machines. Alas, one of them is broken.
AdvertisementYou have a piping hot cup of coffee that’s too hot to drink. You can either pour a splash of cold milk into it and then let it sit for 10 minutes, or first let it sit for 10 minutes and then add the milk. In which scenario will the coffee end up cooler, or are they equivalent? In both scenarios, assume you pour the same amount of milk and it is the same temperature.The coffee will be cooler if you first let it sit for 10 minutes and only then pour the milk in.
Ice floats in water. For a neat bonus teaser, what happens to the water level in a glass when the ice melts? Does it rise, fall, or stay the same? Let me know what you think in the comments.Last week, I posed a bonus poker question in the solution section, courtesy of reader Joshua Lehrer: In Texas hold ‘em against one opponent, imagine you get to pick which two cards you get dealt and which two cards they get dealt. Then the dealer flips the five community cards, with no betting between them .
My gut instinct was to pick the best hand for myself, and the worst hand for my opponent . It turns out that you can do better when you get to pick both hands. Shout-out to readerfrom Las Vegas, who emailed me the correct answer. The answer is to give yourself two kings and give your opponent a king and a 2, where the 2 shares a suit with one of your kings. Awfully unexpected! Apparently, this gives the side with the two kings a 94.
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