Belgian contenders The Red Electrical Devils have won the $1,000,000 Google Tiny Box prize.
There’s a .pdf of the paper describing their design here, but don’t bother trying to read it if the word “schematic” means nothing to you.
Google’s challenge was for a tiny, lightweight device that converts DC (the type of electricity that batteries and solar panels put out) to AC (the type of electricity that is most useful for doing work). Such devices are called “inverters” and improvements in inverter technology would obviously be useful for electric cars, home solar power systems, and many another thing.
The winning team exceeded Google’s minimum requirements to win by three times, creating a device that is ten times smaller than existing technologies while meeting all of Google’s other restrictions (such as 95% or better efficiency, air cooling, &etc.) It’s extremely impressive work.