From Ars Technica:
Kerosene lamps face gravity-powered usurper
A London design consultancy has developed a cheap, clean, and safer alternative to the kerosene lamp. Kerosene burning lamps are thought to be used by over a billion people in developing nations, often in remote rural parts where electricity is either prohibitively expensive or simply unavailable. Kerosene’s potential replacement, GravityLight, is powered by gravity without the need of a battery—it’s also seen by its creators as a superior alternative to solar-powered lamps.