Good used book. There is one page that has a small tear in the middle of the page. Spine is very slightly cocked. Additional Details ------------------------------ Subject keyword: irresponsible; stem; science; technology; engineering; math; kids; elementary; school; experiment; sean connolly; thoughtful; schoolwork; word; problem; summer; activity; christmas; present; girl; boy; child; logic; introduction; algebra; geometry; chemistry; biology; physics; birthday; strategic; solving; challenge; textbook; study