William Hartston is a Cambridge-educated mathematician and industrial psychologist. Between 1962 and 1987 he played chess competitively, becoming an international master and winning the English chess championship in 1973 and 1975. He...

In public estimation and scientific investigations, sloths have undergone an astonishing transformation in the course of the past few years. Thanks largely to YouTube clips posted by the sloth orphanage in Costa Rica, sloths have...