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Low blood pressure is generally below 90/60 mm Hg, but symptoms and context decide when it’s unsafe.

Blood pressure is too high when readings stay at 130/80 mm Hg or above, and 180/120 with symptoms is a medical emergency.

For room humidity, aim for 30–50% RH; above 60% is too high and raises mold and mite risk.

For hair heat limits, most strands handle 300–365°F (150–185°C) with steady motion; higher temps or repeat passes raise damage risk.

Normal hair shedding lands around 50–100 strands a day; steady clumps, widening parts, or ongoing thinning signal a need to check the cause.

Most people do best with baseline sleep plus 1–2 extra hours during illness; watch for warning signs like heavy grogginess or dizziness after long bed rest.

For toddlers, over 24 oz (710 ml) of cow’s milk a day is too much; aim for 16–24 oz with balanced meals.

Most adults stay in the safe zone at 1–2 hours of television a day, with kids needing less based on age.

Healthy screen time for kids depends on age, content, and balance with sleep, play, and school.