The 21st Century Junior Library introduces young readers to important core content. Simple activities encourage students to Look, Think, Make a Guess, Ask Questions, and Create. The combination of reading and inquiring helps them develop the skills needed to master content and learn and succeed in the 21st century. Read all of these 21st Century Junior Library titles to learn about Then to Now Tech: Black and White Photographs to Instagram, Computers to Tablets, Model T to Self-Driving Cars, Phonograph to Streaming Music, Pinball to Gaming Systems, Printing Press to 3D Printing, Silent Films to 3D Movies, Telephone to Smartphones Book jacket.