1...that a Bok globule is a dark cloud of dense dust and gas, first observed by astronomer Bart Bok in the 1940s, in which star formation is taking place within the H II region? 2...that L'Origine du monde, Gustave Courbet's most provocative painting, remained in the privacy of its successive owners for almost 130 years before entering the musée d'Orsay? 3...that Mexican pilot Alberto Braniff was the first pilot to fly a plane over Mexico City? 4...that the British ice hockey team The Blackburn Hawks are often referred to as the Blackhawks, and were briefly called the Lancashire Hawks?