I learned that even Obama knows young people don't use Facebook anymore.

The best diamonds in the world contain mysteries. And years ago, John Hatleberg was unlocking the mystery of one of the best.

When Jon M. Chu first got on Justin Bieber's tour bus in 2010, he was just a promising director who cut his teeth on two Step Up films and a Hulu-exclusive dance series called The LXD. But then Bieber happened, and Chu became something a little more than a director.

Earlier this month, he was named Person of the Year by Time magazine, with the publication saying the Pope had pulled "the papacy out of the palace and into the streets". It has been an extraordinary year for the Catholic Church under the leadership of Pope Francis. In just nine months since taking over from Pope Benedict he has vigorously set about modernising the Church. Paul Vallely, biographer of Pope Francis, has been to Rome for BBC Newsnight to look at the Francis phenomenon.

On most Wednesdays, the Pope gives a general audience, and this one was packed. It was a balmy October morning, and more than a hundred thousand pilgrims, tourists, and Romans had funnelled into St. Peter’s Square. It was the first of three large gatherings Pope Francis presided over that week for a celebration of the family during the Catholic Church’s “Year of Faith.”

South Africa buried Nelson Mandela on Sunday, leaving the multi-racial democracy he founded without its living inspiration and still striving for the "Rainbow Nation" ideal of shared prosperity he had dreamed of.

One of the distinctive features of French intellectual life in the post-war period has been the influence of the German philosopher Martin Heidegger (1889-1976). Heidegger’s standing among French philosophers, especially those working in the phenomenological tradition, contrasts dramatically with his reputation in the country of his birth, where his legacy is tainted irredeemably by his political compromises with National Socialism in the 1930s.

If anyone could claim to be leading by example in an age of austerity, it is José Mujica, Uruguay's president, who has forsworn a state palace in favour of a farmhouse, donates the vast bulk of his salary to social projects, flies economy class and drives an old Volkswagen Beetle.

Colonel Chris Hadfield is a man of firsts. He was the first Canadian to carry out a spacewalk, the first Canadian to command the International Space Station and the first person in history to record a produced music video in space. Because of his unique ability to captivate the world, bringing a focus on space station science and what it’s like to live in space, Discovery News is proud to announce that Hadfield has been selected as the first DNews Person of the Year!

We're not superior to extroverts, we're just differently irritating.

Myths and misunderstandings about both introverts and extroverts abound. Introverts don’t like people. Extroverts are shallow. Introverts are snobby. Extroverts are awful listeners.