Bonus Video:

Ron Eglash: African fractals, in buildings and braids


  1. #1 The Science Pundit
    November 8, 2008

    Nice! I have little tricks for doing arithmetic quickly in my head, but that just blew my mind.

  2. #2 Larry Osterman
    November 8, 2008

    I went to college with Art, he’s been doing this schtick for about 25 years, it’s darned impressive.

  3. #3 Stu Savory
    November 10, 2008

    Hi Greg,
    if you care to look at my blog for 29th Feb 2008, the URL is ,

    I show my readers how to take integer cube roots of e.g. six digit numbers , IN THEIR HEADS, faster than most people can enter the 6 digits in a calculator. Go try it 🙂

  4. #4 Greg Laden
    November 10, 2008

    Stu: cool.