A good puzzle from our friends at Futility Closet:
Three logicians walk into a bar. Each is wearing a hat that’s either red or blue. Each logician knows that the hats were drawn from a set of three red and two blue hats; she doesn’t know the color of her own hat but can see those of her companions.
The waiter asks, “Do you know the color of your own hat?”
The first logician answers, “I do not know.”
The second logician answers, “I do not know.”
The third logician answers, “Yes.”
What is the color of the third logician’s hat?
Puzzle by MIT mathematician Tanya Khovanova. Click here for answer.
Alex Gendler of TED-Ed challenges you to figure out where the recipe for a top-secret sauce recipe is located. Below: All the information in one screenshot.
I'm on record as being a big supporter of learning regular expressions (AKA "regexp") -- handy ways to search through text with very complex criteria. It's notoriously opaque to beginners, but it's such a massively effective automation tool and drudgery reliever! Regex Crosswords help you hone your regexp skills with fiendishly clever regular expressions that […]
The Monty Hall Problem is a probability puzzle, but the actual problem with the Monty Hall problem was just Monty Hall. Probability doesn’t really matter if the game show host has free will and a willingness to mess with you. This is the classic ‘three doors’ problem, where there is a prize behind one door […]
If you’re just jumping into app development for Apple’s devices, you’ve picked a heady time. The new iOS 13 has a ton of new features: A versatile SwiftUI language, a boosted role for Siri and a more robust Photos app, just to name a few. And if you’re making the transition from iOS 12? Get […]
Most people don’t spare a lot of thought on the potting for their plants. Perhaps something with a color that matches the walls, but that’s as far as it goes. After all, the plants don’t care what they’re wearing. Do they? Actually, they might. As eye-catching as the AIRSAI Floating Bonsai Plant Pot is, its […]
With the gains real estate has made over stocks in the past 25 years, it’s easy to see why the rich constantly use it to expand their wealth. What’s slightly less obvious is why only the rich seem to ever break into real estate investment. There are a lot of reasons, but a couple of […]