They got here by taking very different approaches to working out the fundamentals of heat, mass and momentum transfer principles. Rigatoni. Lasagna. Ziti. Bucatini. Rotelle. At 28 kg per person per year, Italians love their pasta, and continue to reign as today's big spenders. But the rest of the world is aggressively playing catch-up. World production nearly doubled between 1998 and 2006, from 6…