Danny Gregory (Everday Matters) is offering some nice prizes for the best illustrated letters he receives before Christmas.
I think this is a fun idea!
BrainTwister #99: Hat trick
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From New Scientist #3569, 15th November 2025 [link] [link] Balls numbered 1
to 9 are secretly placed in three hats, with three balls in each. The total
of ...
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