newsweek.ro/istorie/cuptorul-cu-microunde-un-apara

The microwave oven, invented accidentally in 1945 by Percy Spencer, has evolved from a bulky, expensive device to a common kitchen appliance. The first model, costing $5,000 and weighing 340 kg, was not widely adopted due to its size and price. It wasn't until 1967 that a countertop version became available, making it more accessible. The microwave's ability to cook food differently led to changes in food packaging and cooking methods. By the late 1970s, it became a staple in households, including in Romania after 1990.