Hypothetically, that is.
Here’s a very unethical linguistics experiment that I think would be interesting:
Raising a group of children completely isolated from any language, spoken or otherwise. They would not be fully isolated from people, but those people would not be able to communicate with each other in the vicinity of the children (no speaking, no gestures, etc.) Of course, to isolate them from language would mean strictly controlling their lives (very unethical). Could they communicate with each other, and maybe even develop a language?
https://en.m.wikipedia.org/wiki/Feral_child
Not a controlled environment but it’s happened several times, with varied results.
How many billionaires need to be publicly executed to fix the usa political system.
Title says unethical
Allow all kinds of drugs and other enhancements in sports and see where the limits of the body are
Ultra Olympics
