Dr Mohammad Al-Ubaydli is the leading light in the world of handheld computers for doctors. Out of necessity, all of us-doctors, and nurses alike-are used to holding the world on our shoulders. Here, Mo shows us how much more acceptable it is to hold our world in the palm of our hands. What is in this world? And how much does it weigh? Will we have labour like Atlas and Hercules to keep up with this ever-changing world? And how will this world impinge on medical realities on wards, and in offices and consulting rooms? The answer is not much (vis à vis weight), and rather a lot vis à vis our working lives. The stethoscope still probably wins (only just!) on this scale of weight in proportion to medical impact, but not much else comes close to a handheld computer. I know this thanks to Mo, and now he is about to share all this with you. Let him give you a lift; extend your hand to him-and he will place in yours something rather small, rather fun, and wholly beguiling. While learning all about this, we find that the weight of all our patients' unsolved problems, the world on our shoulders, become less burdensome-but it is when one of those problems is solved by the device in our hands that we realise we all owe Mo a tremendous debt of gratitude for his untiring work in bringing this book its current level of readability and excellence.

Dr Murray Longmore, co-author of the Oxford Handbook of Clinical Medicine