A Karl Marx figure with a “zero euro” bank note which has been produced in his home city of Trier, Germany, as part of bicentenary celebrations. Photograph: Harald Tittel/AFP/Getty Images

Karl Marx is probably the most divisive thinker in modern history. Born 200 years ago this week, his name remains both a rallying cry and an insult. (...)

What if Alexander Fleming’s funding been restricted to a ‘time-locked deliverable’?

The philosopher Georg Wilhelm Friedrich Hegel (1770-1831) found himself at the centre of an unlikely political ruckus in Australia this time last y(...)