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In honor of the actor and activist Nichelle Nichols, this month’s puzzle imagines a Star Trek adventure in which her character, Lieutenant Uhura, faces a life-and-death conundrum.
Readers balanced logical reasoning and mathematical insights to find phony coins with a double-pan balance scale.
Mathematical magic can seem like mind reading. Your job is to reveal the secret behind these four tricks.
The solution to our puzzle about Euler’s number explains why e pops up in situations that involve optimality.
The transcendental number π is as familiar as it is ubiquitous, but how does Euler’s number e transcend the ordinary?
How readers used their geometry skills to survive a dangerous puzzle.
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