Assignment tracks the meteoric rise of Syriza, the new force in Greek politics.
BBC World Service
Andrea Sella on the race to find a cheap inorganic way to mimic nature's green stuff.
BBC Radio 4
4/4 Will looks beyond the British isles to see the monarchy as a global force.
Jane Deith asks if the official figures for hospital waiting times can be trusted.
Mathematician and code-breaker Alan Turing, and his role in the invention of the computer.
3/4 Michael Portillo discovers the Georgian period was not as elegant as we tend to believe.
The challenges facing the upcoming Earth Summit, according to the UN's man in charge.
Roland Buerk reports on Japan's doggy obsession and the demographic time-bomb behind it.
Marek Kukula explores the science behind the Transit of Venus 2012.
Reverend Ernie Rea discusses the role of religion in Nigeria.