July 16 1969: Apollo 11 departs the Kennedy Space Centre, Moonward bound.
July 24 1969: Apollo 11 Command Module arrives Pacific Ocean, returning from Moon.
Mission duration: 9 days.
May 8 2015: Labour Party finds itself short one leader.
September 10 2015: Labour Party finds new leader.
Mission duration: 126 days.
And what is that in the title to this post? Our modern question mark is descended from the punctus interrogativus, a right-to-left lightning stroke perhaps introduced in the West by Alcuin of York in the C8th. The punctus percontativus, a reverse question mark ⸮ denoting a rhetorical question, and by extension irony or sarcasm, was proposed by printer Henry Denham in the 1580s and fell into disuse in the C17th.