WATCH: The answer to why plane windows are rounded

Cape Town - Ever wondered why airplane windows have round edges? Or, thought perhaps they could be a bit bigger if they were square?

Well, there is quite a good reason for their shape, as this quirky little video by Real Engineering shows.

When air travel took to the skies in the mid-20th century, planes started flying at higher altitudes to save on expenses as the air density is lower at 30 000 feet. This allows easier mobility for planes and saves on fuel usage. But in order to remain safe at the distance, the cabin needs to be pressurized correctly. 

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To make things more effective, the cabin was changed into a cylindrical shape to support the internal pressure, explains Real Engineering.  Planes were originally built with square windows but this proved to be dangerous:

"Three airplanes with square windows crashed in the 1950s after the fuselages tore apart during flight. " 

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The bad design of square windows was soon replaced with rounded ones that are now able to withstand the air pressure. 

Fortunately, designers figured out the design flaw pretty quickly. Take a look... 



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