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by Gianni A. Sarcone & Marie-Jo Waeber
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Puzzle # 1A |lateral thinkingLogic | Difficulty level: bulbbulbbulb

Mystery of the String
   Take a string and a pair of scissors and try to cut the string into 0 piece!
   Hint: if you don’t cut the string at all (0 cut), you obtain anyway 1 whole piece...

abracadabrain puzzle 1
Source of the puzzle: © G. Sarcone, Avianca Journal, December 2007.
Please report any error, misspelling or dead link. Thanks!
      

Solution
To puzzle 1A

mystery of the string solutionMystery of the String
   We can solve this problem with a logical argumentation called 'reductio ad impossibile':
4 portions of string are obtained with 4-1 = 3 cuts; 3 portions of string are obtained with 3-1 = 2 cuts; 2 portions of string are obtained with 2-1 = 1 cut; 1 portion of string is obtained with 1-1 = 0 cut.
Then...
   0 portion of string is obtained with 0-1 = -1 cut. And how can we cut something with ‘-1’ cut? Well, that’s ANOTHER problem!

 
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Puzzle # 2A | lateral thinking Lateral thinking | Difficulty level: bulbbulb

abracadabrain puzzle 2

Clever Line
   Is it possible to make the black painted line shorter without touching any part of it?

Source of the puzzle: © G. Sarcone, Puzzillusions, April 2007.
Please report any error, misspelling or dead link. Thanks!
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Solution
To puzzle 2A

clever line solutionClever line
   Draw a longer line next to the first one, the first line is now definitively shorter...

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