I knew someone who took a motion sensor, hooked it up to a sprinkler and turned it into a water sentry gun of sorts. Any time a cat came near the bird feeder for an easy kill, it got wet. The cats ...

It may not be as sophisticated as Samsung’s sentry, but for a backyard DIY project this robotic guardian is damn impressive. It’s got built-in night vision and can track and shoot its targets in the ...