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The invention of mechanical time-keeping machines (clocks) :
Heuristics
Simple, efficient rules, learned or hard-wired by evolutionary processes, that help in making decisions, forming judgments, or solving problems.
Structural
Pertaining to the physical or logical arrangement of a system's parts.
Preoperational Stage
The second stage in Piaget's theory of cognitive development, typically occurring between ages 2 and 7, characterized by the development of language and the ability to think symbolically, yet struggling with logic or understanding the viewpoint of others.
18 Months
A reference to a specific age or time period, often significant in developmental psychology for milestones in infants.
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