Sharon Hewitt Rawlette has written an excellent compendium of coincidence stories with explanations and uses, The Source and Significance of Coincidences. In this guest editorial, she takes apart the ...

This video breaks down how scientists and economists use very large numbers, with clear examples from astronomy, mathematics, ...

Visualising 1 × 10 90 as the number of particles in the universe was seen as a sort of upper limit for all practical purposes for numbers(9 August, p 28). Why bother with infinity? I think we are ...