Fitness basics
Learning Center
Does sunscreen expire?
Wondering whether sunscreen expires? Get the facts about how long sunscreen lasts.
Baby poop: What to expect
Infant stool can have various colors and textures. Know what to expect in your newborn's diapers.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
Sitting risks: How harmful is too much sitting?
Sitting for long periods — such as in front of the TV or at a desk — appears to increase risk of death from cardiovascular disease and cancer.
High-dose flu vaccines: How are they different from other flu vaccines?
High-dose flu vaccines are flu vaccines for older people.
Heart attack prevention: Should I avoid secondhand smoke?
It's possible that secondhand smoke can irritate the arteries and increase the risk of a heart attack.
Triple X syndrome
Females with this genetic disorder have three X chromosomes instead of two. Symptoms can be mild or include developmental delays and learning disabilities.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Blocked tear duct
Watery, irritated eyes may occur when your tears can't drain normally. Learn about this common eye condition that affects newborns and sometimes, adults.
Pyloric stenosis
In this condition, a valve between an infant's stomach and small intestine fails to open enough for food to pass through. Surgery is the treatment.
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