Have you ever sat on a plane and thought: "I wonder why these windows are round and not rectangular or square?"
Ok, well we're going to tell you anyway.
On 10 January,1954, FLIGHT 781 left Rome's Ciampino Airport to carry 35 passengers and crew to London.
About 15 minutes into the flight, the de Havilland Comet jet disintegrated in the sky and crashed into the Mediterranean Sea, killing everyone on board.
Anyway, an investigation discovered that structural weaknesses in the fuselage, caused by stresses at the corners of the square windows, were to blame for the crash; prompting Havilland, the plane's manufacturer, to change the design of the windows to a more rounded shape, while also thickening the wall of the fuselage.
Despite this progressive thinking that is still utilised in aviation engineering to this day, the company never recovered and was dissolved soon after.
And now you know why the windows in planes are round. And now you can sleep easier at night.