Saltwater-powered lamp

In disaster situations where energy is scarce, this would be an extremely useful emergency light.

In disaster situations where energy is scarce, this will be an incredibly useful emergency light. Instead of trying to find a pair of AA batteries, you can simply use a mixture of water and salt to power the Hitachi Maxell Mizusion lamp for 3 days.

The lamp uses oxygen from the air and a replaceable magnesium rod to create the negative and positive electrodes and generate an electric current.

This lamp costs only $26 in Japan, but if you're in another country, it will cost you around $57. Replacement magnesium anodes are sold for just $9.

According to Khoahoc.tv