By Carmen Fernández-Sánchez The simple act of filling recycled plastic bottles with water and chlorine has allowed light to enter millions of previously unlit homes around the globe. What’s more, this innovation has saved low-income families up to 40% on electricity bills. No-one could have told Alfredo Moser, a Brazilian mechanic, that his invention would spread … [Read more...] about Turning trash into light – Liter of light