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But when cognitive science turned its back on behaviourism more than 50 years ago and began dealing with signals and internal maps, goals and expectations, beliefs and desires, biologists were torn. All right, they conceded, people and some animals have minds; their brains are physical minds - not mysterious dualistic minds - processing information and guiding purposeful behaviour; animals without brains, such as sea squirts, don't have minds, nor do plants or fungi or microbes. They resisted introducing intentional idioms into their theoretical work, except as useful metaphors when teaching or explaining to lay audiences. Genes weren't really selfish, antibodies weren't really seeking, cells weren't really figuring out where they were. These little biological mechanisms weren't really agents with agendas, even though thinking of them as if they were often led to insights.

"The core of the revolt against global integration, though, is not ignorance. It is a sense, not wholly unwarranted, that it is a project carried out by elites for elites with little consideration for the interests of ordinary people - who see the globalisation agenda as being set by big companies playing off one country against another. They read the revelations in the Panama Papers and conclude that globalisation offers a fortunate few the opportunities to avoid taxes and regulations that are not available to the rest. And they see the disintegration that accompanies global integration, as communities suffer when big employers lose to foreign competitors."

"What these examples have in common is that they illustrate two of the key tasks of the social sciences: to measure important social variables over time and space, and to identify the social mechanisms that lead to variation in these variables. There are large problems of methodology and conceptual clarification that need to be addressed in both parts of this agenda. On the side of measurement, we have the problems of arriving at consistent and revealing definitions of economic wellbeing, using incomplete historical sources to reconstruct estimates of prices and wages, and using a range of statistical methods to validate and interpret the results. And on the explanatory side, we are faced with the difficult task of reconstructing social processes and forces in the past that may have powered the changes we are able to document, and with the task of validating the hypotheses we have put forward on the basis of historical evidence."

" The inequitable distribution of wealth, political knowledge, and free time in the United States gives wealthy individuals and corporations a leg up on ordinary Americans in the fight to influence public policy. But ordinary Americans have strength in numbers. And as DFP's polling suggests, there are no small number of progressive economic policies that a large majority of working people (from a wide array of regions, religious backgrounds, and ethnic groups) are ready to rally around. The trick is building institutions - and cultivating political leaders - that are willing and able to get that rally started."

Large-scale irrigation infrastructure projects are back on the development agenda in sub-Saharan Africa after a near 30-year hiatus, despite projects having had disappointing results, with social and environmental side effects outweighing benefits. Such projects are planned in response to water scarcity pressures and are seen as a solution to intensify agricultural production, support rural economic development and enhance resilience to climate change.