Human heart

In an image representing organ donation, one person's hands give a plastic heart to another person.
(Image credit: Syda Productions/Shutterstock)

The human heart is a vital organ that pumps blood through the body. You probably don't even think about it, but your heart is always working — it beats about 100,000 times a day, which adds up to about 3 billion beats over an average lifetime. Here's the latest science news about your ticker.

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