ScienceInsights

Cold sores come back because the herpes virus stays dormant in your nerves. Learn what triggers outbreaks and how to reduce them.

Most 6-year-olds need 9 to 12 hours of sleep. Learn how to pick a bedtime, spot signs of sleep deprivation, and build a routine that actually sticks.

Early bed sores often look like redness that won't go away, but they can be harder to spot on darker skin. Here's what to look for and what to do.

At three weeks old, babies can only see clearly 8 to 15 inches away. Here's what that means and how to support their developing vision.

Most people reach deep sleep about 30–45 minutes after falling asleep. Here's what shapes that timeline and how to tell if you're getting enough.

Home eye tests can estimate your prescription, but knowing what they can and can't tell you helps you use them wisely.

Mild swimmer's ear can often be treated at home with a vinegar-alcohol rinse, dry ear care, and OTC pain relief — here's how to do it safely.

Selective IgA deficiency is the most common primary immunodeficiency, yet many people never know they have it. Here's what it means for your health.

Sex in the ocean comes with real health and safety risks, from harmful bacteria and condom failure to physical hazards and legal consequences.

Fluid buildup can stem from heart, kidney, or liver disease, certain medications, or high sodium intake. Learn what's behind edema and when it matters.