How high can you count? A hundred? A million? Maybe even higher? Did you have any trouble learning to count that high – or, as in the new book “A Horse Named Jack” by Linda Vander Heyden, illustrated by Petra Brown, does counting help you keep track of the trouble you’re in? More than anything in the world, Jack loves children. When kids show up on the farm, he romps and plays and smiles. But when nobody comes to visit, Jack gets really sad. And when he’s sad, he stays inside his stable and he’s bored.