Perhaps it's unwise of me to re-open an issue that's essentially settled here, but maybe it's relevant again.
Most likely, you've heard of the new site, History of Science and Mathematics. Danu, and LoganM and I are the pro-tem mods, and perhaps we'll admit to a little shameless promoting here and there on questions on various SEs that might be good on HSM. This, however, is not one of those instances.
DavidZ wrote, perhaps eloquently:
as a rule, physicists tend not to care about it in the sense that a historian would.
That may be true. On the flip side, historians tend not to care about it in the sense that a scientist would. In other words, we're in between everybody, although perhaps we've been leaning a little towards the historian side.
Mathematics has long said that history questions are usually on-topic. The same seems to be the case here. I'm not quite sure about how Biology, Chemistry, and Earth Science, etc. are leaning, but it's probably not a huge issue. History has decided that science questions there are absolutely on topic, and we at HSM informally rejected two migrated questions that someone shunted from History to HSM (to the consternation of just about everybody who cared).
There may be questions that are on-topic on HSM that are not on-topic at any of the other science or math sites. For example, take this question:
Why was Evariste Galois killed?
There was a meta discussion on the topic, with the resounding consensus that all questions about historical figures must relate to the work of those figures. A question about whether or not Albert Einstein liked Wiener Schnitzel would clearly be off-topic (and no, I have no idea). This sort of implies that many questions on HSM would be on-topic on the other science sites.
All the same, though, questions that are less geared towards scientific/mathematical concepts and more towards the historical influence are possibly better for HSM.
As a final note: There seems to be a growing trend on Mathematics of people saying that a given question would be good for HSM. This is actually a problem, as there have been a couple cross-posting incidents. I have also noted once or twice that a question here would be good on HSM. Please, do not cross-post on HSM. It gets a bit messy, and is a pain for everyone. If you feel that your question is better on HSM, talk with the moderators here, as well as the pro-tem mods from HSM. I'm sure we can figure out if the question is suitable for migration.