Recommended for children aged 5+, Do You Know? is a series of levelled non-fiction books featuring video content, project work and critical-thinking activities. Each book asks a range of BIG questions, developing children's language, communication and investigation skills. This Level 1 Reader is Pre-A1 in the CEFR framework and supports YLE Starters exams. Short sentences contain a maximum of two clauses, using the present tense and some simple adjectives. Can you 3D print a house? Do astronauts have 3D printers? Find out more about the science of 3D printing, big and small.