Things that have amazed me from several sci-fi books

do androids dream of electric sheep?

• There are devices to set your emotions

Snow crash

• The librarian.

The diamond age

• Matter compilers!
• The drummers, distributed wetware computing. Information consolidation through fluid exchange.

Space oddyssey

• Turn Jupiter into a sun
• The monolith
• The idea of evolution beyond the meat, and beyond matter

Neuromancer

• Have your brain programmed to produce a drug, hormone or whatever
• The behaviour of Wintermute
• THe possibility of making you incapable of getting high with certain drugs