Salt Water Is All You Need to Power This Lamp for 80 Hours

Hurricanes, earthquakes, elected officials—there are plenty of legitimate reasons to prepare for the end of civilization as we know it, and if the world’s supply of batteries ever runs out, you’ll be glad you had this emergency LED lamp tucked away in your doomsday shelter. Instead of trying to dig up a fresh pair of AAs when the power goes out, all that’s needed to power Hitachi Maxell’s Mizusion lamp for about three days is a mix of salt and water.