Talk:Hard–easy effect

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I do not understand the example. What is its point? Which of these questions is easy or hard? According to Wikipedia at least, the 'modern' zipper was invented in 1913, and there were part-way stages allowing for ambiguaty going back decades earlier (as is so often the case). As for the birth of Buddha, no one is truly sure... and there are good guesses before and after that of Socrates...