Walt walked the sidewalks of NYC before there were sidewalks.
Concrete did not always have concrete existence.
Concrete became widely popular in the 20th Century, with its popularity rising significantly after World War II due to technological advancements and the post-war building boom. While ancient civilizations like the Romans used it extensively, and the 19th century saw major innovations like the invention of Portland cement and reinforced concrete, modern usage for widespread construction and a variety of projects exploded in the 20th century.
— AI summary to the inquiry, “When did concrete become popular?”, 10/22/2025
Spam of Human Affection 
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