Airships could be part of the answer to Africa's infrastructure woes - if the financial challenges are overcome.
Effective altruism is a philosophy and social movement which tries to work out the most effective ways to improve the world. Effective altruists - conform to old-school utilitarian principles - consider all causes and actions, and then act in the way that they believe brings about the greatest positive impact.
Cities are complex and contain just about any thing or concept ever invented by humans. How the city is built, its topography, and how close you live to your work and a grocery store affects your mobility.
Our houses, shops, and factories waste gigantic amounts of energy, often in the form of excess heat. How do we slash this waste? The answer is fairly simple: with a smart thermal water grid.
Leisure activities such as contemplation, going for a stroll or a bike ride boost our overall health, wellbeing, and creativity.
The sun doesn't always shine; the wind doesn't always blow. This is why, if we want to rely on renewables, we need intelligent systems that integrate and coordinate different sources of energy at scale so that when one is scarce or unavailable, the others can automatically compensate.