During an average lifetime, the human heart will beat more than 2.5 billion times. Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump ...

AFib causes an irregular heart rate that can make your heart feel as if it is fluttering or skipping beats. Panic attacks, on ...

View Full Profile. Learn about our Editorial Policies. The simple, constant rhythm of a beating heart is a reassuring sign of life. With each lub-dub, blood brings life-sustaining oxygen throughout ...

as it can revive hearts after they've stopped beating. Story and editing by Chelsea Pineda More from Science The longer a heart is cut off from oxygen and blood flow, the less likely it is to ...