
John Scalzi channels Robert Heinlein (including a wry sense of humor) in a novel about a future Earth engaged in an interstellar war against more advanced species. Citizens volunteer for the Colonial Defense Forces after retirement, in exchange for which they have their consciousness transferred into a young body, cloned from their DNA but enhanced. If, against the odds, they survive two years of combat (or 10 years if things aren't going well, which they're not), they get another body and enjoy a fresh start on a colony. This is Scalzi's first novel, and it creates a future he will revisit in subsequent stories. John Perry did two things on his 75th birthday. First he visited his wife’s grave. Then he joined the army. The good news is that humanity finally made it into interstellar space. The bad news is that planets fit to live on are scarce—and alien races willing to fight us for them are common. So: we fight. To defend Earth, and to stake our own claim to planetary real estate. Far from Earth, the war has been going on for decades: brutal, bloody, unyielding. Earth itself is a backwater. The bulk of humanity’s resources are in the hands of the Colonial Defense Force. Everybody knows that when you reach retirement age, you can join the CDF. They don’t want young people; they want people who carry the knowledge and skills of decades of living. You’ll be taken off Earth and never allowed to return. You’ll serve two years at the front.
Old Man's War - John Scalzi
scifi - the murderbot diaries, old man's war.
The Unincorporated Man (and three sequels)
Cross between science fiction and fantasy: Harry Potter and the Methods of Rationality ("HPMOR") - the premise is that Harry Potter is raised by a good aunt and uncle, and is taught the Scientific Method and so he uses that when encountering magic.
Old Man's War (and sequels) by John Scalzi
Redshirts by John Scalzi
Science-reality: Surely You're Joking, Mr. Feynman!
Ra by qntm
There is no Antiemetics Division by qntm
But ya, I love that genre. eg Haldeman's The Forever War, Scalzi's Old Man's War, Robert Charles Wilson's Spin
It ISN'T Venice you need to make me care about, it's YOU! Why should I spend any of my time on you?
A good first sentence should make me care about your perspective, at least for non-fiction about subjects well-studied.
Fiction, obvs, differs. Scalzi's Old Man's War had such a great first sentence I devoured the series.
John Scalzi is probably my favorite sci-fi author for excellent characters. His “Old Man’s War” is genius.
