Good - Exlibrary, no dustjacket as issued, some cover and page wear from little hands (History) Additional Details ------------------------------ Subject keyword: inventions; inventors;middle school science books;STEM books;innovative projects for grade 4-6;innovations girls;making useful things;STEM innovations;improving an invention; medical inventions; engineering projects; engineering innovations; hands-on technology for middle school; Science books for kids;what is an innovator;inventions that changed the world;inventions no one told you about; Silly putty; who invented the slinky; hands-on science for elementary school;inventions that fight disease;inventions like the microwave;who invented the microwave oven;who invented diapers;who are inventors;famous inventors;create a solar system;make a solar oven;maglev train;morse code; Subject code: