A man who got a double arm transplant from a teenager says that the procedure has left him feeling like a teen as well.
Dairy farmer Karl Merk, 54, has become the world's first double arm transplant patient, after he lost both his arms while working on a corn threshing machine six years ago.
Karl's donor was a young teenager who died in a car accident just hours before his transplant operation.
The German farmer underwent surgery at the Technical University in Munich, which used a 40-strong medical team.
In a statement, doctors said that they did not see any sign that Karl's immune system was rejecting the foreign tissue and that his scars were healing well.
Now, Karl can open a door and turn lights on and off.