Ever noticed that physics had to invoke the creative bookkeeping of potential energy to make the equations work? — Banno
We know how much dark energy there is because we know how it affects the universe's expansion. Other than that, it is a complete mystery. But it is an important mystery. It turns out that roughly 68% of the universe is dark energy. Dark matter makes up about 27%. The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter - adds up to less than 5% of the universe. Come to think of it, maybe it shouldn't be called "normal" matter at all, since it is such a small fraction of the universe. — NASA Science
If energy is the potential for doing work, then what's potential energy, the potential for the potential for doing work? — Metaphysician Undercover
Energy is work waiting to be done. I believe both are measured in Joules or Ergs. — TheMadFool
One way to look at energy is "matter in motion". — Philosophim
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