3 books · Ages 8–12 · Chapter Books
World History Biographies is a 3-book series for ages 8–12 by Philip Steele. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Isaac Newton: The Scientist Who Changed Everything and Marie Curie: The Woman Who Changed the Course of Science are great first picks.
No particular order needed — browse and pick what catches your eye.