Thomas Alva Edison's inventions include the phonograph, light bulb, and movie camera.

Mr. Factor loves fractions! When a prized fraction up for auction goes missing, it is up to Mr...

Iggy Peck loves to build things and solve problems, sometimes out of the strangest materials. His...

From Galileo and his theory on measurement to Rachel Carson and her environmental book Silent Spring...

A mystery animal lurks behind each page. Readers will use the accompanying riddles to gather clues...