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Some doctors in the US made history.
They put a pig's heart in a man.
This saved his life.
This is very big news in science.
Perhaps in the future, there will be enough organs for everyone.
Doctor Bartley Griffith was one of the doctors.
The man's name is David Bennett.
He was too ill to get a human heart.
But now, with the pig heart, we hope that he'll get well.
Muhammad Mohiuddin is a director at the University of Maryland Medical School.
Scientists made some changes to the pig's heart.
They wanted it to work well in the human body.
So, they put some human genes in the pig's heart.
Thousands of people need organs.
Every year many people die.
But pigs' organs can help.
They grow quickly and they are a similar size to human organs.
Muhammad Mohiuddin thinks that animal organs can save these people's lives in the future.
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