Thanks to an alarming episode of "This Is Us" on January 25th, 2018, slow cookers are panicking and wondering if theirs could cause a home fire. First, it's important to note that the fictional show takes place in the 1990s -- slow cooker technology has changed a lot since then. Second, the slow cooker was a used appliance that came with a warning about a tricky switch. Therefore, not all slow cookers are fire hazards. That said, there are plenty of old or unsafe slow cookers out there. When should you replace your slow cooker? Here are four things to look…