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Why are airplane windows round?

In the nineteen fifties, the first pressurized jets had rectangular windows.

Every flight, pressure hammered against the corners — and there, stress could spike 3 to 4 times higher than in the surrounding metal.

In 1954, two Comets broke apart mid-sky — no fire, no warning.

Investigators submerged an entire fuselage in a water tank and cycled the pressure, again and again.

After 3000 cycles, the metal split.

Crack origin: the corner of a window.

An oval spreads pressure evenly around its entire edge — no corners, no weak point.

But the exact shape, the three-layer sandwich inside the glass, and that small hole you've almost certainly noticed on the window… all of that is in the article.

Through a window, we see a landscape — and the quiet memory of two planes that fell so that no corner would remain.