The brightest stars on the SF sky

Mmm, science fiction books. Not everybody's cup of tea, I know. But I like.
I have a soft spot for those SF novels and short stories which focus less on the marvels of the futuristic technology  and more on the social issues. Though there must be a little bit of technobabble included, or it wouldn't be really SF, I guess.
Some SF books ask such astute and profound questions about the future of out planet and our human society that I sometimes think they should be made an obligatory read for all politicians and lawmakers, and perhaps for high school students, too.
And some other books are pure fun and a pleasure to read, and that's scientifically fantastic, too.
So here they are, a handful  of my favorite SF books from different periods and parts of the world.