I remember that during my teenage years, I had this strange, tired feeling in one of my legs that just wouldn't go away, no matter how comfortably I positioned it. I later found out this was called Restless Legs Syndrome, abbreviated as RLS. After a while, the feeling went away, only to return a few weeks ago, some 45 years later. After a few days of discomfort, I asked ChatGPT what the causes of RLS are. It gave me a bunch of possible causes, one of which was caffeine intake. That clicked: I started drinking coffee in my mid-teens (possibly...