Imagine that you're making a magic potion. You're a wizard with a long beard. But -- the potion only works if you wait exactly 45 minutes before you stir it. If you stir it before or after the potion's totally ruined. You don't have a smartphone. You don't have a watch. You don't have any kind of time measuring device. What you have is two fuses of irregular consistency. The one thing you know for a fact is that it takes an hour for each of these fuses to burn from one end to the other. How do you use these to measure exactly 45 minutes?
Image: Scam Nation/YouTube
I'm still trying to figure this one out, so I'm not looking at the comments yet!
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 […]
View this post on Instagram A post shared by Popular Mechanics Magazine (@popularmechanics) on Jan 29, 2020 at 12:14pm PST Sure, you can count them. I did, and, er, I missed a few. Or you can take one of the approaches suggested by the mathematics professors that Andrew Daniels interviewed in Popular Mechanics: “I would […]
The Knight’s tour is a traditional chess problem where a lone knight is placed on a chess board and must visit each square only once. You can play this perfectly simple free implementation created by u/psrwo on Reddit. The source code is at github. The knight is randomly placed at the outset. I can’t visit […]
Assembling a truly autonomous smart home is getting closer and closer to reality every day. But for every new smart bulb, thermostat, home security system and appliance we set loose within our walls, there are still probably a half dozen “dumb” items we’d still love to replace. But whether they’re too costly or too big […]
With so many manufacturers out there these days, it’s tough to know who to trust in the ultra-competitive wireless earbuds market. If you’ve never heard of LinearFlux, you may soon. That’s because it’s a company with a stellar pedigree whose co-founders were two of the engineers behind the original success of two audio houses you […]
Two-thirds of American adults drink coffee every day. On average, they’re each drinking about three cups per day, which works out to nearly 400 million cups downed each and every day. We don’t have stats on what percentage of those cups are God awfully bad, but you have to assume with so many ways to […]