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The mark of the unicorn

Saturday, December 8th, 2012

It’s been a long while since I’ve posted, but hopefully, there are still one or two of you out there who understand the value of a good RSS feed. I’m back to write about a book I’m enjoying, with the following cryptic title: 10 PRINT CHR$(205.5+RND(1)); : GOTO 10 If this line of BASIC code […]

It takes 17 clues to make a Sudoku

Tuesday, January 10th, 2012

The science journal Nature reports that a mathematician has proven that it takes 17 clues to make a Sudoku. Gary McGuire of University College Dublin showed this in a proof posted online on January 1st (apparently he wasn’t partying on new year’s eve). This means that sudoku puzzles with 16 or fewer clues do not […]

Babbage’s Difference Engine No. 2

Friday, May 2nd, 2008

The Computer History Museum in San Francisco has some very cool video of a pristine reproduction of Charles Babbage’s Difference Engine No. 2 in operation, which you can see on their website. Although Babbage never completed one of these machines, former Microsoft CTO Nathan Myhrvold has had one built for his private collection, and it […]