Well, this would require moving the Space Ship parts far back, but I do you have some ideas
Quantum Mechanics should come before Particle Physics, as Particle Physics are governed by Quantum Mechanics, and Quantum Mechanics was developed in the 1930s...
I question the wisdom of inserting Quantum Mechanics into the tree at all, as a tech distinct from the 'atomic' technologies already in there. While the development of QM involved a lot of brainwork by some very smart people, there's only so much room in the tree at all.
Broadly speaking, we have one column of techs for each twenty years or so of the twentieth century- which is about the minimum to represent such a huge jump in technological capability and social change, but still means that for every 20-year period there are only about seven techs to go around. If "nuclear fission" and "atomic physics" are already there, then even wearing my physicist hat I wouldn't want to see yet another 'physics' tech in the early to mid-20th century. Not when it's competing for space with very logical choices like "Total War," or "Feminism" or "Pharmaceuticals" or "Radar."
and the Standard Model was developed in the 1970s.....But I would really like an actual physicist in this case. I am not an expert in physics. But, since it was developed around the same time as the atomic bomb you could place it as prerequisite to Atomic Physics, and make it necessary to have Combustion to research it. You could then put the ability to build a laboratory, to make it earlier as laboratories have been used before the age of computers.
Atomic physics is, basically, the physics of the atom- and our understanding of the atom proceeded in parallel with the advance of quantum mechanics. "Atomic physics" does not simply mean "this is how to make atomic bombs go bang." Arguably, the study of atomic physics began with Rutherford's alpha particle scattering experiments back around 1910.
Although making the laboratory available earlier is a GREAT idea, I totally approve, because it helps compensate for the increased length of the tech tree. The first organized research and development facilities showed up within a decade or two of 1900, depending on how you define the term. What is there in the existing tree that corresponds to techs that were developed circa 1880-1900...
Hm. How about making Electricity the prerequisite for Laboratories? I think that's a fine idea, myself.
Biological Warfare weapons were built in the 1970s, and were operational (Until we gave them up) , so it would make sense to put them somewhere around Computers, as Computers were used in their production, so we could place them after Computers and require you to have researched Rocketry. Once discovering Biological Warfare you could build Biological Warfare Missiles, which would require a Biological Warfare Lab (I'm really milking Next War). Using these Biological Warfare Missiles on an enemy would result in a diplomatic penalty. Although we could also think of a viable way of spreading disease in enemy cities, such as giving Great Spies the ability to carry a virus and then you could sacrifice them to attack, short of adding an Great Doctor Unit.
Using Great People for that role strikes me as a bad idea. It's very hard to get them in the late-game, and sacrificing one for a short-term military advantage... I don't like it.
There was some talk, a while ago, about making 'plague' mechanics for the game, as a way to artificially limit the growth of populations in the early game and make it more costly and risky to push population beyond the limit of a city's health. This might be a good time to think about how to implement them...
Plagues could be a common problem for overpopulated cities in the early and mid-game, nearly disappear in the industrial age as the right combination of buildings and technologies emerged, and then
re-appear (potentially) with the rise of bioweapons... which would carry a grave risk of bombing entire civilizations back into the Iron Age as far as population size and productive power were concerned, because of the sudden outbreaks of plagues in otherwise healthy cities.
Seriously, bioweapons are
nasty stuff. I know some people who know one guy whose job description is "professional nuclear war planner;" a lot of what I wrote in the 'nuclear weapon' descriptions I learned from his writings. He thinks over the effects of nuclear bombs on a regular basis and regards them with respectful familiarity. But biological warfare scares even him.
Something to think about, that.