Here’s a happy little film starring two Yoshimoto cubes, by Justin Lanier and Paul Salomon of Math Munch. Enjoy!

[youtube url=http://www.youtube.com/watch?v=AZi5FhAwFgI]

Here’s a happy little film starring two Yoshimoto cubes, by Justin Lanier and Paul Salomon of Math Munch. Enjoy!

[youtube url=http://www.youtube.com/watch?v=AZi5FhAwFgI]

Put a smile on your face this Friday morning. Here, straight out of Harvey Mudd College, are the Three Directions performing their new smash hit, *That Makes It Invertible!*

[youtube url=http://www.youtube.com/watch?v=O4KCoNvRi6Y]

*via MetaFilter*

In the wake of a flurry of tetrices being constructed in schools all over the country (see this post about fractal Christmas tree worksheets, and this post featuring photos of completed trees), we’ve also been sent a video of a school group constructing an ambitious and impressive fractal structure, using envelopes cleverly folded into tetrahedra. The video is below, and features (eventually) a level 5 Sierpinski Tetrahedron, made from 1024 envelopes!

[youtube url=http://www.youtube.com/watch?v=2lYj5YcPAIg]

Via teacher Tim Dolan on Twitter.

While we were at the big MathsJam conference a few weekends ago, we took the opportunity to point a camera in people’s faces and ask them to tell us something interesting. Because of the high quality of MathsJam attendees, this went better than it would in most other contexts.

Here’s a collection of clips we recorded while people were digesting both their dinners and the first day’s talks.

[youtube url=http://www.youtube.com/watch?v=fg_IeC1M5D4]

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Yesterday I hosted another recreational maths seminar on Google+. I had a lot of fun! We discussed the paper, Seven Staggering Sequences (PDF), by Neil Sloane. In the paper Sloane, the man behind the fantastic Online Encyclopedia of Integer Sequences, described seven of the sequences he found most especially interesting.

The Hangout was just under an hour and a half long, and we managed to get through five of the seven sequences. Some of them are really hard to understand!

[youtube url=http://www.youtube.com/watch?v=MBvyaku9Omw]

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I hosted the first (proper) Aperiodical recreational maths seminar yesterday. We discussed the paper Picture-hanging puzzles, by Demaine et al. Click through to watch the YouTube recording of the session.

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Would you be interested in taking part in a sort of online video-chat seminar about recreational maths? Then read on!

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