A perplexing natural process, occurrence, behavior or phenomenon that makes us ask. What? When? Where? How? Why?

Puzzles inspire curiosity, speculation, scientific inquiry, wonder, folklore and even superstition. Some puzzles call for intense or immediate study and resolution.  Examples: What’s eating my bean plants?  What’s causing honeybee colony collapse disorder?

Others needn’t be resolved, but simply arouse our curiosity and challenge our powers of observation and investigation

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