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 #110: Six, seven
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From New Scientist #3579, 24th January 2026 [link] [link] (a) Two terms of
a sequence are known — the sixth is 6 and the seventh is 7. It is an
arithmetic ...
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