Kelvin Doe: This self-taught engineer invented his own generator and radio transmitter at the tender age of 13, making him the John Ambrose Fleming of his time. Now 20 years old, the Sierra Leonean has also invented a local standby generator out of acid, soda and metal parts scavenged from rural trash bins in his country. This feat earned him a $100,000 contract for a solar project with Canadian high-speed internet service provider Sierra WiFi.
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