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Amazing Sierpinski Tetrahedron

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.

Videos from MathsJam 2012

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]

Recreational Maths Seminar – Seven Staggering Sequences

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]