There was so much going on in this book! I picked it up because I liked her other book on a different topic and this one is new. A man who is a ballet dancer immigrates to Mars as the Earth becomes uninhabitable. That’s a whole thing! He learns that people who are “Earthstrong” (i.e. born on Earth with more muscle mass and adapted to more gravity) are in a weird class of “dangerous” people and treated accordingly. Mars natives live in a genderless society where they’ve been genetically adapted to a planet that is dusty and cold. They are tall. They have musculature developed to the gravity. Then there is some palace-intrigue type stuff which is maybe the bulk of the book and I liked it. I figured out some of the conceits and not others. Also there are mammoths but not in a way that was goofy or felt out of place and shoehorned in. Quite good.