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Puzzles

Cleopatra the Demented

What's on the cards?

The Gobbling Goat

Put the gobbling goat on a diet

The great weights problem

Solution to Puzzle No. 6 world cup medallions

The Great Weights Puzzle

The hint - world cup medallions

Calculating the multiverse

If there's a multiverse, then how many of its component universes are like our own?
Counting the trees of life

How many possible genetic relationships are there between a collection of different species? The answer is mind-bogglingly large.
Blood, oil and water

Sara Zahedi has won a prestigious prize at the European Congress of Maths. Your future medical diagnoses, and even the welfare of sea life, may depend on her work.
Five of Euler's best

Five favourite problems inspired by Leonhard Euler, one of the greatest mathematicians of all time.
What's happening and who's listening?

Why are physicists unsure about what it means to say that something has happened? Anthony Aguirre and Sean Carroll explain.

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