I'm going to be honest here. I have a bone to pick with science.

A week or so ago on Twitter, I tweeted this:

Based on some of the responses I got, I decided to probe a little further. I wanted to see if I was in the minority in my opinion, or if others felt the same way. Apparently, I'm not alone.

Energy (E) is a useful quantity. It has certain properties and connections with other such measures, like momentum p. E is paired with time t, much like momentum p and distance x are such a pair. This pairing is known from classical mechanics and it shows up in relativity: The merging of t and x into one entity, space-time, leads straight to such a melting also of E and p. In quantum physics, the uncertainty Δx ~ 1/Δp is important, and it translates into Δt ~ 1/ΔE. We do not think that momentum p is a substance!