Social Studies Homework

My mom said that thirty years ago they didn't have microwave ovens. Surprisingly, until then I paid little attention to how much they actually help us. When I asked her how her food was heated she said that they did it all on their gas stove. However, not all foods can be heated in this manner, and it does take a lot of time for it to do so. Sometimes the gas stoves don't even turn on. For people who eat a lot of leftovers, she said that microwaves really made life easier for.