A cable of 80 meters is hanging from the top of two poles that are both 50 meters off the ground. What is the distance between the two poles (to one decimal point) if the center cable is (a) 20 meters off the ground and (b) 10 meters off the ground?
Presh Talwalker of Mind Your Decisions says the above riddle was used as an Amazon interview question. His video has the answer.
I found this puzzle in a book I’ve had since I was a kid: Simply put, your task is to draw the figure at the right without crossing a line, without taking your pencil from the paper and without retracing a line. The book is called Merlin’s Puzzler. It’s out of print, but used copies […]
Tenyo is a Japanese magic trick company that’s been around since 1960. They are well known for making clever props. (My friend Richard Kaufman, who often writes for Boing Boing, wrote a 1,400-page two-volume set about the company, called Tenyoism) Here’s a Tenyo puzzle trick called The Perpetual Puzzle (It’s available on Amazon). You start […]
Mathematician, artist, and engineer George W. Hart of “Möbius strip bagel” fame has recently been playing with a laser cutter to create head-spinning warped-grid jigsaw puzzles. He came up with an algorithm to generate the initial patterns but “the real fun is step 2,” he says, “using a geometric transformation to warp things.”
There are plenty of productive ways to spend time while stuck indoors. While it’s undoubtedly fun to binge all 15 seasons of Supernatural or sink days of playtime into an Overwatch campaign, learning something new is definitely a more meaningful and long-term beneficial use of open hours. And if you’re going to invest time in […]
If you’ve ever had any musical aspirations — or even if your talent extends no further than turning on the radio — you’ve probably dreamed the “impossible” dream. You dream that maybe you could record some of your songs at home, post them online, build an armada of fan support, attract major label attention and […]
If you’re charting the fortunes of a business, one glance at the right columns can instantly detail that company’s health. If you want to see their current roster of customers, a spreadsheet can bring those clients into sharp focus. Make no mistake — the world of business is still dominated by the all-powerful spreadsheet. It’s […]