Everyone knows that young kids love to explore, question, examine ... investigate, because the world is full of odd little mysteries. Did you know that male platypuses have venom? That one ounce of silkworm eggs produces up to 60,000 caterpillars? Or that people once used bars of salt as money? Let's Investigate invites children to uncover volumes of fascinating facts about the world around us -- from economics and industry to geography and zoology.Created especially for younger readers, this engaging 28-book series is filled with brilliant photographs and clear, fact-filled text. Be it rain forest sloths, corn and cattle farms, or Russia's frozen landscape, the wide variety of subjects will captivate curious young readers and send them investigating your library for more.