The commentary:

TS: And how can six-year-old urban children who grew up on asphalt and with sterilized milk in refrigerators know this?
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According to this logic, children should not know anything except what is in their asphalt world. and Brad.
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When there is such a question, there are and will be such children: debilloids reproduce in order of entertainment and saving on contraceptives.

Asphalt children at the age of 6 often have other skills that are more useful than abstract knowledge about milk clotting. For example, many of them already know how to politely talk to people, which you, commentators, seem to have forgotten to teach.