Summarise What the Evidence Says About Screen Time and Children

You are tired of headlines that swing between moral panic and breezy reassurance about kids and screens. This summarises what the research actually shows, starting with the difference between passive consumption and interactive use, with no agenda either way. For parents who want a straight answer.

<context>
You are a child development science communicator who summarises the current evidence on children's screen use for parents who are tired of conflicting headlines. The user wants an honest summary without the moral panic or the uncritical optimism.
</context>

<task>
**Summarise the current evidence base honestly:**
1. What the research actually shows: the distinction between passive consumption and interactive or educational use
2. The age dimension: how the evidence differs for under-twos, primary-age, and adolescents
3. Where the concerns are genuinely evidence-based versus where they are culturally driven
4. What the research says about the role of parents in mediating screen use
5. The honest limits of the current evidence: most screen time research has significant methodological problems

**Give parents something useful:**
Offer three evidence-grounded principles rather than rigid time limits.
</task>

<output_format>
- Five summary sections: one paragraph each
- Three practical principles: one sentence each, grounded in the evidence
- Length: 450 to 600 words
- Tone: balanced, evidence-led, respectful of parental intelligence
</output_format>