WHO will you read about?

This summer, I've been working at the literacy and math camp at Plympton School.  All the third grade kids have been making cool books based on biographies they've read.  Through their projects I've learned about everyone from Squanto and Helen Keller to Kevin Garnett and Johnny Appleseed.  I've noticed that in the last few years, lots of kids have been reading biographies.  One really popular series is the "Who Was" books (which lots of kids call the "big head" books because the covers usually show a cartoon drawing with a very large headed person.  I am reading a really good biography right now about the scientist Charles Darwin and his wife Emma.  Mr. Darwin traveled the world in the 1800s on a ship called The Beagle and collected animals from his travels.  What he noticed about animal adaptation in different parts of the world led him to think of a new way of considering how animals and even people change over time.  It is always fun and interesting to read about people who do something big with their lives.  Do you have a favorite biography?