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Braintwister #69: Backward drops
News
BrainTwister #63: A 2025 puzzle
Regulars
BrainTwister #63: A 2025 puzzle
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BrainTwister #61: Mark to mark
News
BrainTwister #59 Seven segments
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Mathematics
Barcodes: How they could be your latest mathematical party trick
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BrainTwister #56: Square sums by four
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BrainTwister #54: New year, new numbers
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BrainTwister #53: Dividing digits
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Mathematics
How Fibonacci numbers give us a neat hack for converting between units
Regulars
Mathematics
The mathematics behind pouring a glass of wine
Regulars
BrainTwister #35: Cube cuts
Regulars