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Calculating the multiverse

If there's a multiverse, then how many of its component universes are like our own?
Political tides

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

Mathematicians explore how opinions spread through a society.
Counting the trees of life

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