Gadget

Gadget

Gadget

 

Solar candle to light Africa

Gadget

Ken Hall has developed a "candle without a flame" that reduces shack fires and cuts carbon dioxide emissions from paraffin lamps and candles.

How to pick an educational app

Gadget

Learners have hundreds of educational apps at their fingertips, but how do parents choose the right ones for their children? Here are some guidelines.