Gigantic thumb war.
But the main Maker trend of the fair was definitely 3-D printers. Guys, I can't explain how it works or why it works or even what the heck kind of purpose these things would serve, but these are printers that make three-dimensional objects. Seriously. They are programmed to make them out of melted plastic, and it takes hours and hours of them very slowly building up the object until it becomes a real thing.
And these adorable tiny robots!