Malcolm Gladwell is a journalist and author

Listening well is a gift. The ability to hear what someone says and not filter it through your own biases is an instinctive ability similar to having a photographic memory.

And I think we have a great deal of trouble with people who have this gift. There is something about all of us that likes the fact that what we hear is filtered through someone's biases.

There are many examples of this phenomenon, but I want to focus on the story of Konrad Kellen, a truly great listener.

During the Vietnam War, he heard something that should have changed the course of history. Only it didn't. And today no-one really knows who Kellen was - which is a shame because his statue should be in the middle of the Vietnam Memorial in Washington DC...