Hello Naomi Thank you for your email. I have just started using powerpoint in my teaching (just love it!) and it has never entered my mind that there were side effects! Have you got an actual urls for this work? Regards Sarah Sarah Stewart Midwifery Lecturer School of Midwifery Otago Polytechnic Dunedin New Zealand Tel: 03 4793642 sarahs@tekotago.ac.nz