The police in Canada say they've foiled a major terror plot supported by Al Qaeda. We speak with Mubin Shaikh, who was one of two undercover agents who helped to foil a major terror plot in Toronto in 2006, and he tells us that Canada's Muslim community has been instrumental in stopping this new conspiracy.
Dzhokhar Tsarnaev has been charged with using a weapon of mass destruction in the Boston bombings last week, and could be executed if found guilty. We speak about the legal debate over his prosecution with Professor Alan Dershowitz, who's been called many things in his career including "the best-known criminal lawyer in the world," and "the top lawyer of last resort"
A campaign to end research into the development of killer robots -- machines capable of selecting and attacking military targets without human intervention -- has begun. Thomas Nash is one of the lead campaigners.
The tricky job of clearing up the man-made debris in orbit around the earth was addressed at a conference in Germany on Monday. We discuss the issue with the man who first worked out that it would become a problem, former Senior Scientist for Orbital Debris Research at NASA, Donald Kessler.