Sources in Kabul say he and his envoys have been involved in secret talks with the Afghan president in Kabul, his representatives in southern Afghanistan and outside the country.

BBC: Pakistan's push for new role in Afghanistan

As you know, I am particularly interested to hear what he will say about a secret conversation he held in the autumn of 2008 with Paul Tucker, deputy governor of the Bank of England - and whether he felt Mr Tucker was in anyway encouraging Barclays to understate its borrowing costs.

BBC: Diamond ��hounded out by MPs��

Part of their secret, they say, is in the catalyst that they use to grow their carbon nanofibre.

ECONOMIST: Space-age soot

Prosecutors say Crundwell began depositing Dixon's money in a secret bank account in January 1991 and continued doing so until her arrest in April 2012.

BBC: Rita Crundwell jailed for $53m theft from Dixon, Illinois

Organisers say 20, 000 students will be eligible to take part in the secret ballot, which will use the question proposed by the Scottish government.

BBC: Glasgow University

In secret filming, former cabinet minister Peter Lilley seemed to say he thought the Chancellor George Osborne had deliberately manoeuvred climate sceptic ministers into key positions.

BBC: UK Politics

"While you're able to say that you don't have U.S. secret prisons, in effect, you may be able to get the benefit through your relationship with foreign intelligence services, " said CNN national security contributor Frances Townsend, who served as President Bush's national security adviser.

CNN: What's next for Guantanamo Bay detainees?

If they were going to announce this in, say, a hotel meeting room, there would be no reason to keep it a secret.

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Not a dully personal secret, like an affair or a small crime or, say, a missing testicle but a scientific secret, that rare kind of secret that, in our current age, still manages to bend our knee.

NEWYORKER: The Region of Unlikeness