With most of us in the developed world more concerned about the flow of electricity to power our computers, TVs and all manner of other wonders of the modern age, it’s easy to forget the massive impact resulting from one of the first widespread public uses of electricity – the humble incandescent light bulb. With a large proportion of the world’s population still lacking reliable access to electricity, the GravityLight hopes to bring the benefits of environmentally friendly artificial light to the developing world.