Come See the Earth Turn, The Story of Leon Foucault, by Lori Mortensen, illustrations by Raul Allen, 2010 Tricycle Press.
The kids remember admiring the Foucault Pendulum when we visited Thomas Aquinas College, and this picture book tells the story of the dedicated scientist! TAC is one of the few places that has one, in their gorgeous Albertus Magnus Science Hall, and Wikipedia has an interesting list of all of the Foucault pendulums in the world.
Calico Dorsey, Mail Dog of the Mining Caps by Susan Lendroth with illustrations by Adam Gustavson , 2010 Tricycle Press.
The illustrations of Dorsey alone are worth the book! What a cute, good dog! Our history studies just covered the California gold rush so this book came to enrich our homework! I am not sure there was ever another official US Mail dog, but if you read this book you too will fall in love with this good dog!