Chinese farmer Ma Yanjun wanted his mother to shower with hot water, so he invented a solar-powered water heater out of ... beer bottles!
Ma's invention features 66 beer bottles attached to a board. The bottles are connected to each other so that water flows through them.
Sunlight heats the water as is passes slowly through the bottles before flowing into the bathroom as hot water, reports China Economy Network.
Ma says it provides enough hot water for all three members of his family to have a shower every day.