Do zombies annoy you? Do you live in dread of a blood moon and what it means to your poor homes? Well fear no longer! There's a very simple way to make your house completely impregnable, without adding a lot of hassle to your life. It involves the nature of doors and how they open. Simply put - place two doors immediately adjacent! Doors can only open in the direction that the opener is facing. Thus, when you place two doors next to each other, they must needs be opened in opposite directions. The zombies in the picture above can never gain entrance because the outer door can only open to the right! In fact, you can leave the inner door open and the outer will still be 100% zombie proof, and you won't even have to rotate yourself around to get outside. This is a very low-tech solution and doable from the get-go.