[Source: Medical X-Press; Image: Unsplash/CC0 Public Domain]

Look both ways before you cross the street, put your dirty dishes in the dishwasher, raise your hand in class if you have a question, don’t cut in line—these directions are the guardrails of life. They lay the groundwork of morality, and hopefully lead to healthy adult lives.

“At about 3, 4 or 5 years of age, children do really become attuned to the fact that there are rules in the world and that they’re expected to follow them, and they even expect others to follow them,” University of Virginia psychologist Amrisha Vaish said.

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