Manufacturers have spent the greatest amount of time fiddling with the most commonly used household appliance: the refrigerator. In the early 2000s, GE set the benchmark, demoing a prototype refrigerator that kept track of groceries and compiled shopping lists based on what was—or wasn't—inside. Trouble was, for the system to work, users had to scan barcodes every time they put in something new. Last year, LG showed off a fridge with similar features, but it suffered from the same problem: a lack of automation. Without that, neither fridge has found much success in the marketplace.