Digression

Leopold Bloom: "What is weight really when you say the weight? Thirtytwo feet per second per second. Law of falling bodies: per second per second. They all fall to the ground. The earth. It's the force of gravity of the earth is the weight."

Frank Wilczek: "Matter is not what it appears to be. It's most obvious property - variously called resistance to motion, inertia, or mass - can be understood more deeply in completely different terms. The mass of ordinary matter is the embodied energy of more basic building blocks, themselves lacking mass"

Bloom, and his creator, would have liked that, especially the phrase "themselves lacking mass"

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