Trends in the size of the nation's homeless population during the 1980s: A surprising result

There are good national estimates of the number of homeless people in shelters in 1984, 1988, and 1990, but only in 1987 is there a reliable estimate of the number of people sleeping in streets. The large increase in the sheltered homeless population between 1984 and 1987-88 could reflect a shift of the homeless from street to shelters rather than a growth in total homelessness. Data from a number of local studies of homeless populations in U.S. cities in the 1980s have made it possible to estimate the ratio of the number of homeless on the street to the number of homeless in shelters and thereby to estimate the size of the national homeless population over this period with some degree of accuracy. Our estimates indicate that the expansion of shelters over the decade did have the effect of reducing the proportion of the homeless living on the street. Still, when we combine the estimated ratios with the estimates of the shelter population in 1984, 1987, 1988, and 1990, we find that homelessness about doubled between 1984 and 1987. We also find that homelessness declined between 1987 and 1990. At its peak, the number of people literally homeless on any given night was less than 400,000. Finally, our results also provide evidence that pure enumerations or censuses of the homeless population lead to undercounts. Both sample censuses and retrospective interview studies provide more complete counts.

Citizen science breathes new life into participatory agricultural research : A review

Participatory research can improve the efficiency, effectiveness, and scope of research processes, and foster social inclusion, empowerment and sustainability. Yet despite four decades of agricultural research institutions exploring and developing methods for participatory research, it has never become mainstream in the agricultural technology development cycle. Citizen science promises an innovative approach to participation in research, using the unique facilities of new digital technologies, but its potential in agricultural research participation has not been systematically probed. To this end, we conducted a critical literature review. We found that citizen science opens up four opportunities for creatively reshaping research: i) new possibilities for interdisciplinary collaboration, ii) rethinking configurations of socio-computational systems, iii) research on democratization of science more broadly, and iv) new accountabilities. Citizen science also brings a fresh perspective on the barriers to institutionalizing participation in the agricultural sciences. Specifically, we show how citizen science can reconfigure cost-motivation-accountability combinations using digital tools, open up a larger conceptual space of experimentation, and stimulate new collaborations. With appropriate and persistent institutional support and investment, citizen science can therefore have a lasting impact on how agricultural science engages with farming communities and wider society, and more fully realize the promises of participation

Physiological Correlates of Volunteering

We review research on physiological correlates of volunteering, a neglected but promising research field. Some of these correlates seem to be causal factors influencing volunteering. Volunteers tend to have better physical health, both self-reported and expert-assessed, better mental health, and perform better on cognitive tasks. Research thus far has rarely examined neurological, neurochemical, hormonal, and genetic correlates of volunteering to any significant extent, especially controlling for other factors as potential confounds. Evolutionary theory and behavioral genetic research suggest the importance of such physiological factors in humans. Basically, many aspects of social relationships and social activities have effects on health (e.g., Newman and Roberts 2013; Uchino 2004), as the widely used biopsychosocial (BPS) model suggests (Institute of Medicine 2001). Studies of formal volunteering (FV), charitable giving, and altruistic behavior suggest that physiological characteristics are related to volunteering, including specific genes (such as oxytocin receptor [OXTR] genes, Arginine vasopressin receptor [AVPR] genes, dopamine D4 receptor [DRD4] genes, and 5-HTTLPR). We recommend that future research on physiological factors be extended to non-Western populations, focusing specifically on volunteering, and differentiating between different forms and types of volunteering and civic participation