Unfailing

The inspiration he's got from the Angry Birds is unfailing. He's been drawing tens if not hundreds of drawings, building, making them out of sand, imaginary plays, you name it and it's been for a month now almost non-stop. With great concentration as only a four year can have.

I have to confess I don't get the Angry Birds thing. Just don't. Understand. What makes it so popular. Is it just me :)