Rotate ICE by hand - no tools, hypothetically

It occurs to me that I could have been less snarky in #18, and said something more like this:

Most of the time, when I've seen posts insisting on something "because laws of physics" that turn out not to hold up, it certainly isn't because the laws of physics were wrong, and usually isn't even because the poster misapplied the laws of physics.

It most often ends up being somewhere in the simplifying assumptions and approximations somebody made about the question—and regarded as so obvious as not to need any empirical testing—before applying the laws of physics to them.