Homes built after 1950 or so are typically heated with either hot air blown through ducts or hot water pumped through baseboard heaters. Older homes often have cast-iron radiators, which produce heat ...
The concrete at the top left is brand new. The concrete sidewalk next to it could be 60 or more years old. Note it is not cracked; only the top layer has worn off. (Tim Carter) Perspective by Tim ...