Salt water powered lamp

In times of disaster when energy is scarce, this will be an extremely useful emergency light.

In case of disaster when energy is scarce, this will be an extremely useful emergency light. Instead of trying to find a pair of AA batteries, you can just use a mixture of water and salt to run the Hitachi Maxell Mizusion light for 3 days.

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

This lamp costs just $26 in Japan, but if you live elsewhere, it will cost you around $57. Replacement magnesium rods are sold for just $9.

According to Khoahoc.tv