Fitness basics
Learning Center
Young-onset Alzheimer's: When symptoms begin before age 65
Young-onset Alzheimer's disease is a rare form of dementia that presents unique challenges. Learn more about causes, diagnosis and how to cope.
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
Placenta: How it works, what's normal
Understand how this pregnancy organ works and what conditions can affect it.
Erectile dysfunction: Nonoral treatments
Get the facts about shots, penis pumps and other ED treatments that don't involve taking medicine by mouth.
How fit are you? See how you measure up
Find your fitness level with these simple fitness tests.
Mental health: What's normal, what's not
Normal mental health vs. mental illness — Find out how mental disorders are defined and diagnosed.
Suicide: What to do when someone is thinking about suicide
Take action when you see warning signs that someone is thinking about suicide. Talk with the person. Be sensitive and direct. Urge the person to get help.
Fitness training: Elements of a well-rounded routine
Is your fitness training program complete? Here's help to make sure you have all the basics in your program.
Delusional parasitosis
Learn more about this condition and positive steps you can take to manage the symptoms.
Oral health: A window to your overall health
Find out about the link between your oral health and overall health.
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