Measuring risk in surgery; what is a micromort?

What is a 'micromort'? Even more of a worry, what does ten of them mean? How do we measure and communicate risk to patients? Everyday activities all carry inherent risks, how do we put surgery into a context 'everyday people' can more easily understand? Recorded on day two of EBPOM 2017; Professor Monty Mythen presents with guests, Professor Sol Aronson, a tenured professor at Duke University and Executive Vice Chairman in the Department of Anesthesiology, and Dr Mike Irwin, Professor and Head, Department of Anaesthesiology, University of Hong Kong. Taken from a longer conversation to be found here: http://www.topmedtalk.com/ebpom-2017-pod-two-live-from-london/