India, Aug. 13 -- We are so used to travelling in airplanes that certain unique features inside an aircraft rarely surprise us. Take, for instance, the windows inside a plane. Generally, we see square and rectangular windows in most buildings and vehicles, but why do airplanes and jetcrafts always have round windows?

How strange would it be if you walked down the aisle of an airplane and buckled up next to a square window? It is not just a design choice; moreover, the rounded window edges are one of the crucial safety features of an aircraft. It is even more necessary than your seatbelt and life jacket, which are tucked underneath your seat.

Commercial aircraft fly at altitudes over 30,000 feet (approximately 9,144 metres); for referenc...