Ladybird Do You Know? is a STEM-based ELT graded reading series recommended for children aged 5+ who are learning English as a foreign or second language. These levelled non-fiction books feature video content , project work and critical-thinking activities . Each book asks a range of BIG questions on STEM topics from nocturnal animals to building bridges, developing children's language , communication and investigation skills . The five levels progress from CEFR Pre-A1 to A2 . Visit the Ladybird Education website for online video content, audio, comprehension activities, and suggestions for project work. Viruses and Bacteria, a Level 4 Reader , is A2 in the CEFR framework and supports YLE Flyers exams. The longer text is made up of sentences with up to three clauses, more complex past and future tense structures, modal verbs and a wider variety of conjunctions. Why do we get colds? Can we grow bacteria? What are antibiotics? Find out more about cells, Petri dishes and Penicillin.