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 2 Reader is A1 in the CEFR framework and supports YLE Movers exams. Short sentences contain a maximum of two clauses, introducing the past tense and some simple adverbs. How big were the first computers? What is binary? Find out more about the science of computers.