Anyone who really really wants to get into most homes will be able to, but there are some things you can do to make your home a bit safer (more so for the typical break in type scenario than for end of the world). You can plant plants around your windows such as barberry which have pretty purple/red leaves to keep the wife happy, yet are literally a PITA covered in thorns that will prevent people from wanting to come in via that route. You can also screw your windows shut, which makes them harder to pop out of the tracks. You can replace your exterior doors with steel and hang them so that they open out and not in as typical doors do. It's a lot harder to kick in a door opening out than one opening in. Oh and those little brass wood screws that come in all door lock, dead bolt kits. Throw those away. Go to the hardware store and get 4 inch screws to replace them with.