There are thousands of people in the UK on organ transplant waiting lists, so I'm intrigued that scientists are finding different ways of getting organs.
American researchers are trying to see if they can grow a human pancreas inside a pig by editing genes and using stem-cell technology. They think this method could also be used to grow other organs, including hearts, kidneys and lungs.
It sounds great, but I'm a bit worried. Will pigs be grown on a large scale just to make organs for people?