Engineers at Liter of Light have created a product that can bring light to people in poor communities and remote regions, but also help the planet at the same time by recycling plastic bottles and creating light by using solar power.
But, the absolute best bit is the fact that it's such a simple concept. A bottle with a bit of water attached to a solar light.
The only real question is why we didn't think of it first.
Video produced in partnership with Explorist.