Inside China's animal cloning factory

With a robotic rover driving on the Moon and the world's fastest supercomputer, China is emerging as a new superpower in science.

The country is spending vast amounts on research - so much that one leading British scientist says China is on course to overtake the US in 30-40 years' time.

Science editor David Shukman was given rare access to one key area of Chinese research - a laboratory which creates around 500 cloned animals per year.