I suggest that instead of going back in time to kill your grandfather (or any other male ancestor) you get him the perfect gift: a book about all that cool sci-fi he watched while growing up (assuming he ever did grow up!
I know just the book: The Physics and Astronomy of Science Fiction by….me!
That is, me, Steve Bloom. Yeah, its been out for two years, but I know that all of you haven’t bought it yet. I’m keeping track!
So, don’t delay, get it from the publisher (McFarland) or your favorite online bookseller.
BUT WAIT, THERE’S MORE! Nah, just kidding. Its just a book. Sorry!