Monthly marathon

01 September 1989
Comments Other It is very hard for a competition compiler to assess whether a particular puzzle is easy or difficult. He or she may think that the solution is glaringly obvious (or impossibly difficult), but the entrants may not spot the essential clue, or may see so...
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Seventy-five years ago...

01 September 1989
Comments Other Personally, I should find it much easier to believe that the corn-drill was partly responsible, for its effect would be to limit the number of possible breeding-sites; only it does not appear from the information received that any considerable proporti...
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