I Wonder Why Zippers Have Teeth and Other Questions about Inventions (I Wonder Why (Paperback))
Publisher: Tandem Library
Published: August 2003
Language: eng
Format: School & Library Binding
ISBN-13: 9780613969635
Subjects: Juvenile Nonfiction; Science & Technology - How Things Work; Technology - How Things Work/Are Made; Children's 4-8 - Technology; Children's Books/Ages 4-8 Nonfiction
First sentence: Inventors try to solve problems.