I was on Twitter one night recently (that never happens) and someone replied to one of my tweets, encouraging me to look at Richard Thiessen’s posts at aimsedu.org. So, I did. What caught my eye, and my imagination, was the O’Beirne Puzzle. So cool!
Last night, I made my own, with my amazing husband’s help. Then I made a (less cheesy than usual) video. Enjoy!