In 1344, the heart icon with two lobes and a point appeared in a manuscript, The Romance of Alexander. The scene containing the heart image appears in the lower border of a page decorated with sprays of foliage, perched birds and other motifs characteristic of French and Flemish illumination.

Although people feel much busier with work these days, the total time people are working – whether paid or otherwise – has not increased in Europe or North America in recent decades.

One of the biggest implications of social physics turned out to be election results and the surveys that provide accurate poll result predictions.

Random samples worked in some cases, and the ‘central limit theorem’ calculated a mean value to find out the smallest sample ...