Aerobic exercise
Learning Center
Exercise intensity: How to measure it
To get the most out of exercising, aim for moderate to vigorous exercise intensity. See how to judge your exercise intensity.
Guide to different tick species and the diseases they carry
Learn about different tick species and some of the diseases they may carry.
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.
Heart attack symptoms: Know what's a medical emergency
Watch for these heart attack symptoms.
Heartburn or heart attack: When to worry
Chest pain? Learn the potentially lifesaving difference between heartburn and a heart attack.
Helping baby sleep through the night
Help your baby sleep through the night.
High blood pressure and pregnancy: Know the facts
Concerned about high blood pressure during pregnancy? Find out what you can do to reduce your risk of complications.
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
Infant development: Milestones from 10 to 12 months
Budding curiosity drives infant development between ages 10 and 12 months.
Infant development: Milestones from 4 to 6 months
Milestones for most 4- to 6-month-old infants include increased alertness and evolving motor skills.
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