Agree. I enjoy the annual origami puzzles too: http://erikdemaine.org/puzzles/

kapitalx · on March 20, 2012

I enjoyed his 'family' tree. Showing his academic ancestry to the likes of Fourier and Euler at the bottom of this page: http://erikdemaine.org/family/

JadeNB · on March 20, 2012

As the note at the bottom of the page mentions, the 'tree' part of that can be got for any mathematician from the wonderful Mathematics Genealogy Project: http://genealogy.math.ndsu.nodak.edu/index.php.

While we're on collaborations and curiosities, I could have sworn that there was a page out there that would try to calculate your Erdös number automatically (maybe through MathSciNet?), but I can't seem to find it.

tomdeakin · on March 20, 2012

Tried the "Black and White Squares" one. Was pretty fun and definitely suitable for 'young folders'!