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In the early days of aviation, several airplanes suddenly began breaking apart during flight. Investigations later revealed that the sharp corners of square windows caused pressure to build up in those areas. Over time, the constant stress weakened the metal around the window frame until cracks beg…

In the early days of aviation, several airplanes suddenly began breaking apart during flight. Investigations later revealed that the sharp corners of square windows caused pressure to build up in those areas. Over time, the constant stress weakened the metal around the window frame until cracks began to form. Engineers eventually discovered that rounded windows distribute pressure much more evenly, which is why modern aircraft use them today on every Commercial Airplane.