The past two decades saw a shift of the centre from teachers to students in Hong Kong education. One aim of a student-centred pedagogy is to help students acquire an ability to articulate their own ideas effectively in writing and in oral communication by engaging them in self-learning, for example, reading. In CUHK, much effort has been paid to promote a culture of reading and peer-discussion in general education (GE). However, choice of teaching materials, topic selection and facilitation of group discussion of science issues in a GE course are a challenging task. Euclid's Elements has been referred to as one of the most influential classics ever written. This book shows essential features of modern science and is an instrumental example to demonstrate the differences among analytical, logical and associative thinking. In this talk, I will use Elements as an example to share with you how to design discussion topics for a science text and facilitate group discussion in a GE course.