Fitness basics
Learning Center
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
Heat and exercise: Keeping cool in hot weather
Use these tips to avoid problems when exercising outdoors in hot weather.
Helping children cope: Tips for talking about tragedy
Helping children cope with tragedy isn't easy. Consider practical ways to support your child.
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.
Home birth: Know the pros and cons
Understand the possible risks and how to plan and prepare for a home birth.
How fit are you? See how you measure up
Determine your fitness level with this simple fitness assessment.
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 you hear
Your ears enable you to gather and interpret sounds from the world around you.
How your brain works
Which part of your brain does what? Take a tour.
Iron deficiency in children: Prevention tips for parents
Learn how much of this key mineral your child needs and what the health risks of not getting enough are.
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