My father introduced me to the “Cross the Network” puzzle when I was a kid. Here it is, as described by Martin Gardner in one of his early Mathematical Recreations columns, which ran in Scientific American from the 1930s to the 1980s.
One of the oldest of topological puzzles, familiar to many a schoolboy, consists of drawing a continuous line across the closed network shown in Figure 51 so that the line crosses each of the 16 segments of the network only once. The curved line shown here does not solve the puzzle because it leaves one segment uncrossed. No “trick” solutions are allowed, such as passing the line through a vertex or along one of the segments.
It turns out there is a solution. Is it a “trick?” That’s up for you to decide.
This puzzle, and many others, are in Gardner’s Hexaflexagons and Other Mathematical Diversions: The First Scientific American Book of Puzzles and Games. Used copies available cheap!
Cloud Computing: My trip through the Starmaze: a world in the 9th dimension
There are times when I get tired of all of the major sites and apps that make up a lot of the seen Internet. Sadly, I was born too late to experience the wonder of Geocities and intricate handmade websites run by just a single person. But, on some evenings, I still search for those […]
Cloud Computing: Can you solve the “scrambled box tops” puzzle?
Here’s a puzzle from Martin Gardner’s Mathematical Games column, which ran for many years in Scientific American. I found it in his low-priced Dover edition anthology, My Best Mathematical and Logic Puzzles. Imagine that you have three boxes, one containing two black marbles, one containing two white marbles, and the third, one black marble and […]
Cloud Computing: Watching this guy solve a sudoku is deeply satisfying
Simon Anthony is cohost of a sudoku YouTube channel called Cracking the Cryptic. In this video he solves a difficult sudoku puzzle with extra constraints. It’s really fun to watch him solve it and get more excited as his sense of wonder grows (“This is like the universe is singing to us,” he says as […]
Cloud Computing: You can get a Philips Momentum 43-inch LED 4K monitor for about $500
This is truly a golden age for fans of a big ginormous TV screen. Not too long ago, to buy a television over 40 inches usually meant wheeling one of those massive Mitsubishi or Toshiba projection monoliths into your home, consuming a vast portion of any room at a cost of potentially $7,000 to $8,000. […]
Nearly 30 years after it started its run as the most dominant productivity software ever created, the Microsoft Office suite of programs are now virtually synonymous with personal computing. From its days bundled with Windows to its current life as Office 365 cloud-based apps, there’s no reason to think perennial hits like Word, Excel and […]
Photography isn’t just about lighting and composition anymore, especially when you’re shooting with your smartphone. While a wealth of expertise can absolutely help you grab better images, sometimes it’s just about having a great light or an amazing smoothing gimbal to instantly elevate your Instagram pics and other social videos from meh to standout. To […]