Jeremiah Murimi and Pascal Katana, two Kenyan engineering students have invented a bicycle-powered mobile charger to help people in remote Kenyan villages keep their mobile phones charged up. Until now, charging a phone has meant travelling great distances and then paying $2 for a charge. The students plan to sell the charger for around the cost of two charges ($4.50) and it takes about one hour of pedal power to charge a phone (the same time it takes if it was plugged into the mains electricity supply), but saves the lengthy round trip. The students are using bits of broken radios and TVs to build their chargers, and have been working on a very small scale, but hope to expand. Read more on BBC News.