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Amazon Mechanical Turk (MTurk) is a crowdsourcing system in which tasks are distributed to a population of thousands of anonymous workers for completion. This system is increasingly popular with researchers and developers. Here we extend previous studies of the demographics and usage behaviors of MTurk workers. We describe how the worker population has(More)
As HCI researchers have explored the possibilities of human computation, they have paid less attention to ethics and values of crowdwork. This paper offers an analysis of Amazon Mechanical Turk, a popular human computation system, as a site of technically mediated worker-employer relations. We argue that human computation currently relies on worker(More)
This paper discusses what kinds of computer information systems might be of broad social value in the context of the increasingly severe ecological and social consequences of economic growth, and how they might be built and maintained. The paper has two parts. The first offers a particular understanding of the ecological and social " limits " to economic(More)
BACKGROUND Antiretroviral regimens with simplified dosing and better safety are needed to maximize the efficiency of antiretroviral delivery in resource-limited settings. We investigated the efficacy and safety of antiretroviral regimens with once-daily compared to twice-daily dosing in diverse areas of the world. METHODS AND FINDINGS 1,571 HIV-1-infected(More)
An outbreak of tuberculosis due to Mycobacterium bovis among 46 rhesus monkeys housed in individual cages in the same large room of a closed experimental colony appeared to originate in one male that had been in the laboratory for 25 months. During this time, the animal received a total of 17 intrapalpebral tuberculin tests and two chest radiographs, all of(More)
Research in many fields argues that contemporary global industrial civilization will not persist indefinitely in its current form, and may, like many past human societies, eventually collapse. Arguments in environmental studies, anthropology, and other fields indicate that this transformation could begin within the next half-century. While imminent collapse(More)