Years ago a primary teacher told me about a great series of lessons she had just had. The class had visited rock pools on the seashore, and when she asked them about their observations they talked about: it was like a factory, it was like a church, it was like a garden, it was like our kitchen at breakfast time, etc. Each student s analogy could be elaborated, and these analogies provided her with strongly engaged students and a great platform from which to develop their learning about biological diversity and interdependence. In everyday life we learn so many things by comparing and...