Fitness basics
Learning Center
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
How well do face masks protect against COVID-19?
Face masks can help slow the spread of coronavirus disease 2019 (COVID-19). Learn about mask types, which masks to use and how to use them.
How to tell if a loved one is abusing opioids
Anyone using opioids is at risk of misusing these medicines. Don't ignore signs of harmful or illegal use. Taking action could save a loved one's life.
How fit are you? See how you measure up
Find your fitness level with these simple fitness tests.
Herd immunity and COVID-19: What you need to know
To protect groups of people over time, it helps to know what level of recovery or vaccination in a population makes it hard for a germ to spread.
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
Hand-washing: Do's and don'ts
Done properly, hand-washing is a simple way to prevent the spread of germs and avoid getting sick.
HPV vaccine: Who needs it, how it works
Learn about how the HPV vaccine works, who needs it and what side effects to expect.
Guide to different tick species and the diseases they carry
Learn about different tick species and some of the diseases they may carry.
Friendships: Enrich your life and improve your health
Friendships can have a major impact on your health and well-being. Follow these tips to make and sustain lasting friendships.
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