I found a very inspiring video on Mashable.com. It's about a fifteen year old boy from Sierra Leone who is a self-taught engineer. He does things like creating a battery to power his home since the power only comes on once in a week. Of course, given the lack of supplies there, Kelvin makes a battery out of baking soda, acid and scrap metal. Think about that next time your favourite TV show is cancelled and you are tempted to complain. You get the idea. He has also created a radio transmitter and is the DJ for his own radio station. He broadcasts news and music to his community.
Here is a link to the page on Mashable about Kelvin.