plus.maths.org

Puzzles

Making a very special number out of primes.

Cross Katastrophion 1: Platinum

Cross Pandemonion 1: Gold

Cross Hypernion 1: Platinum

Cross HyperLogikion 1

Hypernion 2: Gold

Katastrophion 3: Platinum

Katastrophion 2: Platinum

It's our second Katastrophion puzzle, difficulty level platinum.

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Calculating the multiverse

If there's a multiverse, then how many of its component universes are like our own?
There may be more than one of you

The possibility that there might be many parallel worlds has just become a little more likely.
Stuff happens: From finance to fundamental physics

Current physical theories suggest that beautiful symmetries underly the fundamental particles and forces of nature. We describe those symmetries using an analogy from economics, and even rediscover the famous Higgs boson.
Counting the trees of life

How many possible genetic relationships are there between a collection of different species? The answer is mind-bogglingly large.
Political tides

Politician Douglas Carswell has been arguing with scientists about what causes the tides. We've figured out who's right.

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