Clark, who has died aged 90, was a zoologist of invertebrates and dedicated teacher who solved two great puzzles in insect ...

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few pieces as possible. In a new study, researchers have finally proved that the ...

Meet the wizards behind Word Games and The Atlantic Puzzler. Emily Cox and Henry Rathvon are full-time freelance puzzle writers. This is not a profession they ever anticipated pursuing.