Give me a list of science fiction books that every sci-fi fan should read.

The following books are strongly recommended for any science fiction fan to read:
- The Three Body Problem Trilogy by Cixin Liu
- Dune by Frank Herbert
- The Robot Series by Isaac Asimov
- Foundation Trilogy by Isaac Asimov
- Ender's Game by Orson Scott Card
- A Hitchhiker's Guide to the Galaxy by Douglas Adams
- The Stand by Stephen King
- The Children of Men by PD James