Computing department at St Olave’s Grammar school invited Professor Paul Curzon, former Director of studies for Computer Science at Sidney Sussex, College, Cambridge, currently working in the School of Electronic Engineering and Computer Science at Queen Mary University of London, to deliver a session on " The Magic of Computer Science" for Yr 9 and Yr 10 students on Monday 25th of June. In the session he looked at the links between magic and computing. This was to provide an opportunity for all KS4 students (not just students studying GCSE Computer science) to learn and explore the field of Computing. Students were able to explore his research in designing safer medical devices and used magic tricks and optical illusions to understand the ideas. He discussed when people make mistakes using technology it is important to look at how to improve the system, rather than blaming the person, if disasters are not to repeat and lives are to be saved. The session enabled students to see the importance of Computer Science in real life. Professor Curzon has won several awards for excellence in teaching and public engagement and is co-author of the book “The Power of Computational Thinking”.