As you may have seen from Matt Parker’s latest video, there is a new contest for the recently discovered Hat and Spectre tiles! For more details about this recent discovery please see the MoMath article about this “ein stein” (a pun for “one stone” in German).

Continue reading “Ideas for the Einstein Mad Hat contest”## MakerFaire Central Oregon is coming up!

Central Oregon Maker Faire is less than a month away! This is the place to be for interesting robots, solar cars, sustainability or various interesting DIY projects.

Continue reading “MakerFaire Central Oregon is coming up!”## ChatGPT is bad at math? Turns out, so is Microsoft’s assistant.

Recently it was noted, by Arstechnica and others, that ChatGPT doesn’t seem to be great at math questions – recent tests have found one can get wrong answers much more often than a calculator, and even apologize if you insist that it is wrong (suggesting it doesn’t know math after 2021… lol). but what about other similar assistants?

Continue reading “ChatGPT is bad at math? Turns out, so is Microsoft’s assistant.”## de Bruijn sequence, security, and the surprising reason your phone requires pressing enter on the lock screen

de Bruijn sequences (also known as Ouroborean rings in *Professor Stewart’s Cabinet of Mathematical Curiosities*, p. 44) are an interesting topic that have a surprising connection to moving across a square, and the security of most phone unlock screens. These sequences make a compact listing of all the possible values, in a repeating (cyclical) string of values.

## SoME Math contest is back

The Summer of Math Exposition (run by 3blue1brown) contest is up and running: https://some.3b1b.co/

Continue reading “SoME Math contest is back”## Belchou’s Aces – an oldie but a fun mathematical card trick!

In *Mathematics Magic and Mystery by Martin Gardner*, he describes a trick that was published in an earlier publication in 1939. This one is easy to set up and surprising, as you can have a friend run the whole trick with a few simple instructions, no *sleight of hand*! Here’s how it works:

## Computer vision and insect vision – compared

If you have been experimenting with the widely used OpenCV project, you may have found the StereoSGBM functionality that tries to find the difference between two images to find depth!

Continue reading “Computer vision and insect vision – compared”## Another look at Zipf’s law, and you can chart it yourself!

In a previous post I showed some interesting facts about Zipf’s law and how many different things show a pattern of logarithmic decrease with the most popular or numerous item largely being much more so than the very rare ones – in a logarithmic pattern. Let’s look at that pattern and how you can chart it…

Continue reading “Another look at Zipf’s law, and you can chart it yourself!”## What day is Pi Day?

Today is Tuesday, Pi day (3/14)! Pi day is a national holiday celebrating mathematics, pi, and yes sometimes some baked pie and Pi-zza…

As 3/14 is a Tuesday, so are April 4, May 9, June 6, July 4, August 8, September 5, October 31, November 7, and December 26th!

Last year Pi day was on a Monday, the year before, a Saturday. Back in 2000, Pi day was Tuesday… Check out the math trick that lets you find the day of the week for *various dates throughout history*!: Check out James Grime’s full explanation of the trick:

## The Tic-Tac-Toe Magic Square trick

In *Mathematics Magic and Mystery* by Martin Gardner, the author presents an interesting card trick to create a magic square (where all rows and columns add to the same number), using an interesting interactive game with a participant. After playing a game of tic-tac-toe, your friends will be surprised to see they set up the cards in a 3×3 grid summing the number on the cards to 15!