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Posted on March 21, 2016 How tall is that tree?How can you determine the height of a tree without chopping it down? | Posted on December 21, 2014 100 prisoner escapeA classic prison escape puzzle featuring 100 prisoners, 100 boxes and 100 tickets. | Posted on October 05, 2012 Septic FelineTwenty word puzzles you can solve by adding the letter 'S' | Posted on July 30, 2015 Carnival of Mathematics #125Carnival of Mathematics blog-roll, episode #125 |