The first, that their pretensions to this possession of an art properly so called in their art of speaking are entirely unfounded; and the second, that they are involved in a profound mistake in their confusion of the good with the pleasant. ↗
I met a hustler at a dinner party. He had been invited because I was looking for an adviser to help me with the street scenes. So we put him on the film. ↗
As for sticking strictly to presently known science, I will simply point out that we have already experienced at least two major revolutions in science in this century alone. ↗
I think the international appeal of SF is quite understandable since the kinds of people who like to read it, are, by the nature of the beast, interested in other cultures, of which other nations on Earth are the closest available example. ↗
When something hasn't been around much for a while, and one example of it turns up and catches people's eyes, they go looking for more like it - until they get tired of it again. ↗