A CD has a radius of 12 cm for a playtime of 74 minutes because it is the playtime of Beethoven’s 9th symphony.
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The modern Pizza as we know it was invented in 1889, Raffaele Esposito.
He named it the Margherita, in honor of Italian king Umberto I’s wife, Queen Margherita… though the full history is rather more complex: http://en.wikipedia.org/wiki/History_of_pizza
(*) If you are friendless, this my be the right thing to start gather some!