This is a follow-up of sorts to my recent post on aliens, robots, and perpetual motion. There, I rather harshly criticized the tendency of many science fiction (henceforth SF) writers to portray robots, androids, and sometimes aliens as being capable of functioning with no energy inputs of any kind. It gets a bit irritating for those of us who are scientifically inclined, and it would be nice, once in a while, to see someone actually address the issue—having a robot being charged, for example.
Despite this, I have still enjoyed many books, movies, and TV series with such perpetual-motion robots. I watched Star Trek: The Next Generation throughout its run, despite the fact that Data never once was shown being charged. I also have read all the robot stories of the granddaddy of robot stories, Isaac Asimov. Even he, to the best of my knowledge, never explained how robots are powered (I am open to correction on this if anyone has any references). Certainly, Asimov knew better. The thing is that, as he himself pointed out, the appeal of robots in fiction is not mainly about how they work, but our fascination with human-like beings we ourselves have created. It is the mixed fascination and fear, expressed as far back as Frankenstein—fascination that we ourselves become like God; fear that our creations will rise up against us. The very play that gave us the word “robot”, R.U.R. (an abbreviation for “Rossum’s Universal Robots”), by Karel Čapek, expresses this fear explicitly—the robots rise up and overthrow mankind.
The point is that sometimes SF gives us potent themes that are more important than details that get the science exactly right. This leads to the topic I want to talk about here: What should one expect from good SF in terms of scientific accuracy? That is a long-debated topic, and I make no claims to come to a definitive conclusion here; but I do want to look at some of the things that work for me, personally, at least.