If you have kids under 12 years old, chances are you have heard more than you ever wanted to about Minecraft. For the uninitiated, it’s a hugely popular video game about a guy named Steve who has to mine for minerals to help him build a home, grow food and stay away from killer Zombies, Creepers and other nasties. As I learned from my 7-year-old son, one good trick to keep Zombies away from your mine is to aggressively and evenly spread out torches along the walls, thereby....