My 7-year old is a big fan of the Nickolodeon show Avatar: The Last Airbender from a few years back (he's watching them now on DVD). If you're not familiar with it, you need to know that:
1. It's a very good show (poor-quality animation but an excellent storyline, characters and lessons, and is enjoyable for both kids and adults)
2. It has absolutely no connection whatsoever with the James Cameron 3D "FernGully in Space" movie by the same name
3. There was an M. Night Shyamalan live-action film adaptation of the show that was shockingly awful and bore little resemblance to the excellent TV series.
The basic premise of the show is that there's an alternate-reality world composed of 4 different vaguely Asian nations, each representing one of the 4 major "elements": Fire, Air, Earth and Water. Within each nation, a small number of people are elemental "benders"--that is, they have the power to control/manipulate their element.
All is well until the Fire Nation decides to start attacking the other countries; according to legend, the only one who can stop the war is the Avatar, which is essentially a Dalai Lama-like reincarnating spiritual leader, reborn as a young boy, who has the ability to bend/control all 4 elements.
In any event, my son and I were just talking about solar panels and renewable energy in general, about the difference between solar panels, wind turbines, hydroelectric dams and geothermal energy, when he suddenly said something that gave me a momentary "holy shit! he's right!" moment:
"Those are the four nations from Avatar!"
Yup, he's right--the 4 major renewable energy sources just happen to be:
Solar Panels (Fire Nation)
Wind Turbines (Air Nation)
Hydroelectric (Water Nation)
Geothermal (Earth Nation)
I have no idea what greater meaning this have. Perhaps this was done by the writers as a deliberate eco-friendly message, but it would be far cooler if it was sheer coincidence.
Plus, my son is awesome :)