Yeah, I think it's inherently more striking to think about mass "becoming" energy, or the "energy content" of mass, than about the converse. Imagining energy "c

Yeah, I think it's inherently more striking to think about mass "becoming" energy, or the "energy content" of mass, than about the converse. Imagining energy "condensing" into mass is wild, but we spend a lot more time around mass qua mass than around pure energy.