Ken Robbins

Describes different kinds of tractor trailers, or big rigs, and the loads they haul.

From flowers to fruits, everything begins with a tiny seed. Young readers will learn how seeds grow, and how they vary in shape, size, and dispersal patterns.

The mile gets its name from the term mille passus, which means "a thousand paces." The abbreviation for pound (lb.) comes from the Latin libra pondo. Feet, pounds, quarts, miles: these are words we use every day. But where did they originate, and what do they actually mean?