Two teens built this Lego robot to sign Christmas cards for them

Christmas card writing sucks (or so I'm told — I’ve going to be honest and admit that I’ve never actually written a Christmas card in my life). But, you know what would make things better? Robots. Robots make everything better! And the only way to improve on a card-writing robot, of course, would be to make it out of the most fun toy in the world: Lego! Which is exactly what creative teenagers Sanjay and Arvind Seshan have done. The Holiday Plott3r is a Lego MindStorms-powered