Chapter 6 described an experiment with a tight fitting jam jar lid. It showed how a science topic, in this case the topic of differential expansion rates, could provide meaningful listening practice in a language class. This present example "'how"' how a topic from math. Can provide equally meaningful and at the same time more active work in a language lesson. .Here is an example of some measuring work done by two eight-year-old English primary school children in their maths lesson.