Jill Paton Walsh: The Green Book (EBook, 2012, Square FIsh) 4 stars

A fantastic little story we read as a class back in 5th grade IIRC. Looking back this was probably what was one if the first sparks the started my love for Science Fiction. Its ending also contains one of my favorite story tropes when done right. Probably does not set the world on first as a whole but it made an impact on me as a child when no other book quite did at that age to the point to where I can still remember it.