The idea is so simple, yet a kind of genius. With just a few strips of metal, table salt and tap water, or seawater, their brilliant invention can bring light to millions of homes that don’t have electricity, and can’t afford gas.

   Thanks to the sisterbrother team Aisa and Raphael Mijeno in the Philippines, thousands of underprivileged families in the country, especially those living in rural communities that don’t have access to electricity can now benefit from their brilliant invention: this lamp. It looks like any ordinary handheld lamp. But it has one huge difference.

   This lamp requires no fuel. All you need is a few strips of metal and salt water, and you will have this bright lamp that can run for eight hours. Aisa Mijeno came up with the idea while working for Greenpeace in one of the rural communities in her country where residents use kerosene-powered lamps as primary light source. She also saw....

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