A central goal of the learning sciences is to discover principles that determine the optimal amount of instructional assistance to support robust learning (Koedinger & Aleven, 2007). We examined learning outcomes from providing and withholding stepwise instructional explanations as students studied worked examples and solved physics problems. We hypothesized that students would acquire more con...

Neurodegenerative diseases are chronic, progressive and incurable illnesses that ultimately lead to death. The patient deteriorates inexorably towards the terminal phase of the disease when he becomes mentally and physically incapacitated. This article discusses the many ethical and moral dilemmas faced by the clinician and family members as they care for patients with neurodegenerative illness...

Anecdotal evidence indicates that electricity producers use production failures to disguise strategic reductions of capacity in order to influence prices, but systematic evidence is lacking. We use a quasi-experimental set up and data from the Swedish energy market to examine such behavior. In a market without strategic withholding, the decision of reporting a failure should be independent of t...

This paper presents a puzzle about justification and withholding. The puzzle arises in a special case where experts advise us to not withhold judgment. My main thesis is simply that the puzzle is genuinely a puzzle, and so leads us to rethink some common assumptions in epistemology, specifically assumptions about the nature of justification and doxastic attitudes. Section 1 introduces the commo...

Online brand community has become an important channel for consumers to exchange knowledge about products. However, because of the lack of explicit incentive mechanisms, users may withhold their effort in knowledge contribution. Although the underlying mechanism about why users contribute their knowledge has been well studied, the factors determining the knowledge withholding behavior are rarel...

We analyze a drastic price increase in the German auction market for reserve power, which did not appear to be driven by increased costs. Studying the market structure and individual bidding strategies, we find evidence for collusive behavior in an environment with repeated auctions, pivotal suppliers and inelastic demand. The price increase can be traced back to an abuse of the auction’s pay-a...

Advances in medical technology during the past 3 decades altered the scenarios of our dying. It is now possible to prolong life, with the frightening reality that we also can extend death. This paper examines challenges to dying well in America, defines key end-of-life dilemmas faced by critical care nurses, and examines legal and ethical issues related to dying persons' care. These issues incl...

BACKGROUND The aim of this study was to describe the kinds of ethical dilemmas surgeons face during practice. METHODS Five male and five female surgeons at a University hospital in Norway were interviewed as part of a comprehensive investigation into the narratives of physicians and nurses about ethically difficult situations in surgical units. The transcribed interview texts were subjected t...

BACKGROUND The first of the atypical antipsychotics introduced in the 1970s, clozapine remains the most efficacious neuroleptic to this day. However, serious and potentially fatal side effects have necessitated careful regular monitoring among prescribing clinicians. Some adverse effects (e.g. ischaemic bowel) remain under recognized, while newly identified adverse effects continue to be descri...