Here's one for you: What do you consider the most important invention of all time? This is a hard question, I know. I'm going to sleep on this one before I venture an answer. Maybe the best we can come up with is a top 10 or top 25 list.
That reminds me, I once visited a reconstruction of a colonial doctor's office. There was the jar where he kept the leeches, and, of course, there were the trepanning tools (shudder!) and other hideous surgical instruments. I think I would have stayed sick and risked death rather than go to the doctor back then. For this and a few other reasons I'm not at all nostalgic for earlier times. I prefer the eternal present to either the past or the (uncertain) future.Medicine - to go from bloodletting and leeches to someone thinking of injections is fascinating to me.