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. ↗
Traditionally, photography is supposed to capture an event that has passed; but that is not what I'm looking for. Photography brings the past into the present when you look at it. ↗
There are so many things that come into writing a recipe, and it's really important if you're writing for home cooks to be cooking like you are at home. ↗