Airplane Windows are always Round, and Never Square. Do you know Why?

Square windows have weak points at the four corners, and under extreme stress due to pressure difference, there is a chance they would crack at the weak points. This is what happened in the Comet crashes. Since then, the shape of plane windows was changed from square to round or oval. A round window has no weak or stress point and can bear the immense difference in pressure inside and outside the plane. The round windows really do ensure we have a safe flight.