For the first time, scientists have grown a human heart valve from stem cells.  If the use of this replacement tissue proves to be successful in animals, we will see it used to help patients suffering from heart disease within three years. Artificial valve replacements of today do not perform the intricate functioning as living tissue does.

"The way a living valve functions, it anticipates haemodynamic events and responds and changes its shape and size. It's completely different from an artificial valve which will just open and shut. The heart muscle itself will appreciate something which will make it free to contract properly," said Prof Yacoub.

From stem cells, scientists have grown tendons, cartilages, and bladders.  Organs are much more complex, consisting of dozens of different cells.  Nevertheless, science estimates they will grow a whole beating heart within ten years. 

In the meantime, take care of your one and only.  For a strong heart equals a healthy body.