Here's a puzzle from Martin Gardner's Mathematical Games column, which ran for many years in Scientific American. I found it in his anthology, My Best Mathematical and Logic Puzzles, which is only $3.76 on Amazon.
Imagine that you have three boxes, one containing two black marbles, one containing two white marbles, and the third, one black marble and one white marble. The boxes were labeled for their contents – BB, BW, WW – but someone switched the labels so that every box is now incorrectly labeled. You are allowed to take one marble at a time out of any box, without looking inside, and by this process of sampling you are to determine the contents of all three boxes. What is the smallest number of drawings needed to do this?
It looks like any other Rubik’s cube, but for the little mechanical squeaks it makes as he scrambles it. He puts it down on the table and watches it in silence for a while. Then it moves.
You thought those single color jigsaw puzzles were difficult? Try putting together one where the pieces change colors! That’s just what the latest offering from artist Clemens Habicht does: 1000 CHANGING COLOURS is a colour gamut jigsaw puzzle of 1000 pieces in which each individual tile has two distinct colour states from intersecting gradients of […]
NUTCASE is a deceptively simple cast metal puzzle by legendary puzzlemaker Hanayama. If you’re not planning to try it yourself, here’s how to solve it.
Speed reading isn’t just an innate skill possessed by a lucky few. Anyone can learn to speed read, and the benefits are endless. The brain can process more information than most people have time to soak up, but you can make that time now with the 2018 Award-Winning Speed Reading Bundle. The first half of […]
Sure, you could use the same old PowerPoint templates for your next business presentation. It’s not like you have bosses or investors to impress. Oh wait, you do? Time to augment that slideshow with Slideshop – the presentation tool that can individualize your pitch while saving you time. Compatible with PowerPoint, Keynote and Google Slides, […]
Multinational companies have used the no-nonsense methodologies of Six Sigma and Lean Six Sigma to oil a smooth-running operation for years. What is it? Six Sigma (and its offshoot, Lean Six Sigma) apply the principles of science to business, teaching managers to methodically target waste, maximize output and streamline the flow from producer to consumer. […]