Might need to add a more precise definition of the subject base to the title. Just about all students k-12 in CA take Spanish. I haven't read your source but I presume it's college electives rather than all students.

That's the hope. Similar but different is delaying with l-dopa that makes dopamine production easier. Same idea. Turn up the gain on a fading signal.

By the time Parkinson's is diagnosed, 80-90 % of the relevant diamond m dopamine neurons are dead. It's kind of like raising the volume on a call with a bad connection. It kind of helps, but at some point your just amplifying noise and there's not enough good signal no matter how loud you make it.