They do the best they can, but it’s actually impossible to do the real scientific method with human participants without going all Frankenstein crazy. Keep in

They do the best they can, but it’s actually impossible to do the real scientific method with human participants without going all Frankenstein crazy. Keep in mind these are relatively minor effects, kind of like how not walking for at least an hour a day will shorten your total lifespan by a measurable bit, but people are living so long that only a small number care.