Matter is not what it appears to be. Its 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. Nor is space what it appears to be. What appears to our eyes as empty space is revealed to our minds as a complex medium full of spontaneous activity.
-Frank Wilczek
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