When I was pretty young - maybe six - I spent about a month at a hospital in the USSR. I don’t know why I was there (observation?), and it’s not be point - the point is, while there, slightly older patients taught me how to fold beautiful paper airplanes, with unbelievable aerodynamic properties - I mean those things could fly.

Many years later, I was taking an aerodynamics course at Embry-Riddle Aeronautical University taught by Bob Sweginnis (died in plane crash, while practicing aerobatics), who dedicated an entire class to a paper airplane contest. The winning criteria was “plane that stays in the air the longest wins”.

My plane came in second - I designed it to make an easy curve through the bungalow to maximise air time, and Bob Sweginnis did an excellent job launching it. He stopped the timer when my plane hit the wall of the bungalow, with plenty of altitude to spare.

The winner? A sheet of paper, basically, that pendulumed to the green carpet in a swinging motion, like a leaf, about a second slower than it took my Mona Lisa to commit suicide.