To pay homage to Italian supremacy, here's a super article on the invention of the espresso.
The essential points: the definition of espresso:
A jet of hot water at 88°-93°C passes under a pressure of nine or more atmospheres through a seven-gram (.25 oz) cake-like layer of ground and tamped coffee.
And: "The man to finally surpass the two-bar brewing barrier was Milanese café owner Achille Gaggia."
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