Before revision: In the modern era, since the advent of central heating, hearths are usually less central to most people's daily life because the heating of the home is instead done by a furnace or a heating stove, and cooking is instead done with a kitchen stove with ovenplus microwave oven, toaster oven, or other home appliances; thus many homes built in the 20th and 21st centuries do not have hearths.
After revision: In the modern era, since the advent of central heating, hearths are usually less central to most people's daily life because the heating of the home is instead done by a furnace or a heating stove, and cooking is instead done with a range (combination kitchen stove and oven) alongside other home appliances; thus many homes built in the 20th and 21st centuries do not have hearths.