You might have lazily wondered at some point of your life as you sat through a flight as to why aeroplane windows are always round or slightly curved. With cars and bikes constantly improvising on their designs, why is it that aeroplanes all over the world have the same old round/curved windows?

Could there be a scientific reason behind it? Turns out there is. And the engineering behind it is awesome.

The windows weren't always round

First of all, they were not always round - planes had rectangular windows, just like the regular ones in our houses and cars. 

But as aerospace engineering started making progress in technology, carrying more passengers and flying with more speed, the planes have also changed shape to increase their safety levels - including the windows.