Head of business Dan Roberts explains the role of short-selling in the recent plunge in the value of the pound against the dollar.
The new US president has taken the first steps to close Guantánamo Bay, by halting the military tribunals. Diplomatic editor Julian Borger looks at the difficulties Barack Obama faces as he moves to restore US compliance with international law.
Historian Simon Schama assesses the merits of Obama's speech on Tuesday and compares it to previous inaugural addresses.
Westminster correspondent David Hencke explains why the details of MPs expenses may now be publicised – and how our politicians feel about it.
Peter Walker meets veterans of 1950s nuclear tests, who are fighting for compensation for being exposed to dangerous levels of radiation. They are taking their case against the Ministry of Defence to the high court.
