About 20 percent of the world's population still lacks access to electricity, according to the World Bank. Those who use kerosene as a source of light at night face the danger of fumes and fire.
Lighting startup Nokero has launched what it calls the world's most affordable solar bulb, the N180-Start, which sells for $6 on its Web site.
The bulb has a 5-lumen LED that can shine for about four hours on a full charge after hanging outside in the sun. … Read more