That might have been Protector, but his novels cross over so much I’m not sure.
Ringworld.
The simple answer is: Never time travel without Mr. Spock.
Spock is the best wing man.
Being your own grandparent is nothing a well-adjusted family couldn’t cope with.
I can be a disappointment for even more generations!
Philip J. Fry bolts in panic.
Being his own grandpa enabled him, and only him, to defeat the brains.
Not to mention that otherwise he wouldn’t exist anyway.
I was given to understand that the recognition sign is
I had not previously heard of this particular branch of what I call “wacky science”.
Oh, it wasn’t a human egg?
Lately I’ve been feeling like the whole flat earth thing is symptomatic of Trumpism as a whole - a million different bits of evidence which obviously prove a thing, that come from simply living in the modern world, all get rejected as part of some sort of grand conspiracy that involves huge numbers of people, and the remaining proofs are too complicated for them, so they get misunderstood/rejected for that reason. They then come up with simplistic, overlapping, incoherent, conspiratorial worldviews to replace reality that, when you poke holes in them, they move the goalposts and ultimately fall back to a position that makes no positive assertions at all, but just denies the reality-based position(s). It’s true for everything - a round Earth, climate change, germ theory of disease, how tariffs work, all manner of geopolitical realities… This really is the world we’re in now.