Arthur Benjamin: Lightning calculation and other “Mathemagic”

Posted by Greg Laden on November 8, 2008
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Bonus Video:


Ron Eglash: African fractals, in buildings and braids

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Comments

  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

    http://home.egge.net/~savory/blog_feb_08.htm ,

    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.