Let's Think through Science' is intended to develop thinking in pupils aged 7 - 9 years. It comprises 15 lessons based on science topics frequently taught in years 3 and 4. The lessons can be implemented in primary classrooms, using equipment and resources that are available in most schools and within the time usually allocated for science. This unit has been created by Natasha Serret, King's College, London, Anne Robertson, London Borough of Hammersmith & Fulham and Sue Sissling, London Borough of Harrow.