I think the biological sciences are still in a golden age of incredible discovery that has already changed the species, potentially but not categorically for the better. The kind of bookish, school-centered culture required for this activity has been at least temporarily shoved aside (but not plowed under) by social turbulence and other social tendencies and needs. Fifteen years in a lab to instate a scientific advance doesn't compete with other more temporary hoopla, social media, amplified drama. So if we want IQ and the benefits that accrue, the means are there, but they aren't intensely entertaining on a daily basis, and they require a certain amount of work to understand at all. Some caffeine and tobacco can further the cause, but in moderation. The trick is to perk up the intellect without bogging down the bodily machinery. I think various street drugs and mis-applied prescription drugs are a huge drag on public morale -- that's pretty well established.