Our editors handpick everything we recommend. We may receive revenue for sharing this content or when you shop through our links. Read more here. When you leave the house for the day, what’s the last thing you check? Back door locked. Straightener off. Windows shut. Maybe a quick glance at your phone before heading out? It’s a familiar little ritual – part habit, part peace of mind. But as it turns out, what we are actually worrying about when we turn the key is shifting in a beautiful way.