Linking science and citizenship is an exciting new cross-curricular way of linking science to the wider world. It works with children's natural curiosity and questioning skills to tackle topical and moral issues relating to scientific developments, otherwise overlooked in day-to-day science teaching. The way in which the author has taught science and citizenship, within the Philosophy for Children (P4C) framework, lends itself to open discussion and the freedom to challenge ideas and concepts within a "safe" environment. It is not intended to be carried out within the (precious little) science teaching time available, but in citizenship/PSHE/circle-time sessions, therefore supporting the science topic being taught and opening up more cross-curricular links. In this article, the author describes ways in which he integrated science topics into PSHE and circle-time sessions in his school. (Contains 3 figures and 2 online resources.)