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By renewing our driver’s license at the DMV, most of us are aware of the process of registering to become an organ donor should the worst come to pass. But there is another group of organ donors — living donors — who are helping relatives, friends and even strangers by donating a kidney or part of their liver. Living donors who choose to give a kidney — the most commonly donated organ — can live a full life with the remaining kidney.

Think of the word “infertility,” and you might picture a couple without children struggling to get pregnant or stay pregnant. But there is another set of people — those who have successfully conceived and given birth to one or more children — who struggle with infertility, too. Called secondary infertility, the condition often carries an extra burden: Those affected by it might feel guilty over wanting another child; those close to them may be unsympathetic because they are already a parent; or frustrated because getting pregnant the first (or second) time was relatively easy.

What is the difference between cardiovascular disease and heart disease?

These two terms are often used interchangeably, but there is a difference. Cardiovascular disease is an umbrella term that encompasses several heart conditions, including heart disease, coronary heart disease, stroke, heart failure and peripheral artery disease.

At least 2.7 million Americans have atrial fibrillation, or a-fib, the most common kind of irregular heartbeat, also known as arrhythmia. A-fib is caused when the heart’s upper chambers beat erratically or quiver and don’t sync with the heart’s lower chambers. Learn more about how a-fib occurs.