INTRODUCTION Incessant ventricular tachycardia is a rare arrhythmia which can be life threatening. Treatment with anti-arrhythmic agents may occasionally fail. CLINICAL PICTURE We report 2 cases of incessant ventricular tachycardia. The first case was a young man with idiopathic left ventricular tachycardia who was in incessant ventricular tachycardia despite treatment with multiple anti-arrh...

In the context of open-pit mine planning, uncertainties including commodity price would significantly affect the technical and financial aspects of mining projects. A mine planning that takes place regardless of the uncertainty in price just develops an optimized plan at the starting time of the mining operation. Given the price change over the life of mine, which is quite certain, optimality o...

layer over the South Pole in the late 1970s went undetected for years. The satellite instrumentation did not fail; rather, the computer programs written to analyze the vast volumes of satellite data were instructed to reject measurements that diverged sharply from expected normal conditions. Amazingly, the rejected values were called to no one’s attention. Noticing outliers in ground-based reco...

While uncertainty has always been a part of human experience, scientific results in our current age imply that a unifying theory is out of reach, probably forever. If we are to survive the dangers of resurgent irrationality and accept that we have reached the end of ideology, than we will need to recognize a 'new rationality', a pragmatic and critical approach based on relative cenainties. The ...

Uncertainty is a pervasive feature of climate change analysis. This paper explores the consequences for policymakers. Importantly, uncertainty means that every policy has a range of possible outcomes rather than a single estimate. At a minimum, this requires policymakers to decide how to compare these different outcomes and to determine the likelihood that each outcome occurs. While objective a...