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New Scientist puzzle #42: The card conundrum

One person finds one solution to an equation, another finds two different ones. What's going on? Plus, the quick quiz and answers to puzzle #41

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New Scientist puzzle #41: Hen party dorm

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New Scientist puzzle #40: Light bulb moment

New Scientist puzzle #40: Light bulb moment

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New Scientist festive puzzles #35 to #39: A bunch of brain teasers

New Scientist festive puzzles #35 to #39: A bunch of brain teasers

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New Scientist puzzle #34: Ant on a tetrahedron

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New Scientist puzzle #33: The mountain pass

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New Scientist puzzle #32: Rearranging books

New Scientist puzzle #32: Rearranging books

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New Scientist puzzle #31: Three hats

New Scientist puzzle #31: Three hats

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New Scientist puzzle #30: Sticking in a pin

New Scientist puzzle #30: Sticking in a pin

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New Scientist puzzle #29: How many strips?

New Scientist puzzle #29: How many strips?

A piece of wood cut into squares: how many blocks can you cut out of it? Plus, answer to puzzle #28 and the quick quiz

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New Scientist puzzle #28: A well-timed nap

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New Scientist puzzle #27: The goblin game

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New Scientist puzzle #26: Evening out

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New Scientist puzzle #25: Car crash maths

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