In 2009 author and philosopher Brian Christian took part in a competition to prove that he was human.
The Loebner Prize for artificial intelligence asks people to pit themselves against artificial intelligence to see if a computer can fool the judges into thinking it is a man.
After the competition judges crowned Christian the Most Human Human. He went on to write a book about the experience in an effort to find out what really sets us apart from the machine.
In an interview with Gareth Mitchell he describes how he outwitted his competition.