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The writer cannot be a mere storyteller; he cannot be a mere teacher; he cannot be a mere entertainer. He must be all of these and more.
Children totally accept — and crave — family rules. “In our family we have a rule for X” is the only excuse a parent needs for setting a family policy. In fact, “I have a rule for X” is the only excuse you need for your own personal policies.
The beauty of physics lies in its ability to explain the complexities of the universe with simple principles.