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Colleagues said he tweeted more than any professor they knew, and Calestous Juma’s tweets covered a swarm of things. Income inequality, and a free-trade area for Africa, you might expect. Those were the subjects he taught at Harvard: getting poorer countries, especially in Africa, to grow and thrive was the obsession of his life. But he also tweeted about a wheelchair that could climb stairs, the increasing size of steaks, and the maximum number of goats seen eating up in a tree. He was extra-delighted to send out a New York Times editorial, from 1878, about Thomas Edison’s new “aerophone”: “Something ought to be done about Mr Edison, and there is a growing conviction that it had better be done with a hemp rope.”

Calestous Juma, a prominent global advocate for sustainable development in struggling countries, particularly in his native Africa, could trace his passion for technological innovation to his arduous childhood in colonial Kenya.

A professor of the practice of international development, and a writer of great range, Calestous Juma promoted technology for the poor and vulnerable throughout the world. He also wrote a book explaining why people are wary of innovation, and delighted his more than 100,000 Twitter followers by retweeting cartoons that ribbed those who are resistant to science.

Many energy consumers, and even analysts and policymakers, confront and frame energy and climate risks in a moral vacuum, rarely incorporating broader social justice concerns. Here, to remedy this gap, we investigate how concepts from justice and ethics can inform energy decision-making by reframing five energy problems — nuclear waste, involuntary resettlement, energy pollution, energy poverty and climate change — as pressing justice concerns.

"This article first considers the ways in which experimental psychology and psychoanalysis hastened the obsolescence of ideas about the so-called 'primitive mind' and, in some cases, served the purposes of overtly anti-colonial politics. It then surveys the history of intelligence testing in the British Empire, which originated in the aftermath of the First World War, expanded in scale after the Second, and ultimately contributed to post-colonial development. Finally, it asks how far the case of psychology puts the very concept of 'colonial science' into question."

"The Rio+20 process is an important reminder of the urgency to guide global production and consumption patterns with sustainability principles. Sadly, there is really no genuine global institution that is championing sustainable development. The vision that inspired Rio has been supplanted by two extreme positions. The first is a group that believes economic growth will have trickle-down benefits for the environment. The environmental camp has successfully replaced the spirit of Rio with a one-sided agenda that leaves little room for recognising the central role that human wellbeing plays in natural resource management."

Cell phone use has grown faster in Africa than in any other region of the world since 2003....Of course, South Africa—the most developed nation—still has the highest penetration, but across Africa, countries have leapfrogged technology, bringing innovation and connectivity even to remote parts of the continent, opening up mobile banking and changing the way business is done.

Realist scholars have long debated the question of how much power states need to feel secure. Offensive realists claim that states should constantly seek to increase their power. Defensive realists argue that accumulating too much power can be self-defeating. Proponents of hegemonic stability theory contend that the accumulation of capabilities in one state can exert a stabilizing effect on the system. The three schools describe different points along the power con­tinuum. When a state is weak, accumulating power increases its security. This is approximately the situation described by offensive realists. A state that con­tinues to accumulate capabilities will eventually triggers a balancing reaction that puts its security at risk. This scenario accords with defensive realist as­sumptions. Finally, when the state becomes too powerful to balance, its oppo­nents bandwagon with it, and the state’s security begins to increase again. This is the situation described by hegemonic stability theory. These three stages delineate a modified parabolic relationship between power and secu­rity. As a state moves along the power continuum, its security increases up to a point, then decreases, and finally increases again. This modified parabolic re­lationship allows scholars to synthesize previous realist theories into a single framework.