O.k.,my first choice from the library: Our Family Tree has beautiful illustrations but he snored through the text. I guess he expected more detail. He kept saying, "Yes, but how?" and "How do they know all of this?"
I've got a library hold on look at "Life on Earth" by Steve Jenkins and I'm also going to buy "Born with a Bang: The universe tells our cosmic story" by Jennifer Morgan. It's a three book series. Second title is From "Lava to Life" and the third is "Mammals that morph." DS is going to love those. He can read them over and over, one at a time and ask all his questions until he moves on to the next.
