In year's past, my wife and I have always been nervous about leaving the windows open on our house when we aren't there or overnight because people in our area love break into houses via open windows.
I know there are safety devices out there so you can keep windows open and not have to worry about people getting into your house, but after I started looking for them, I realized I am not sure what I am getting into. I also know that some people simply stick nails in their windows, but I am not sure what that means exactly, either.
How do they work? Are there any recommendations? Anything I should be looking for?