Martin McGuinness

I lost a lot of friends at the hands of the British Army. The person who actually introduced me to my wife, Colm Keenan, was murdered by the British Army. He was a member of the IRA, but he was unarmed.

Obviously, Ian Paisley and I were regarded as very bitter opponents. When we decided in March 2007 to govern together, both of us understood that we weren't going to change our views but that we had to work with one another if we were to end the conflict and move forward.

In terms of weapons, the best disarmament tool so far is nuclear energy. We have been taking down the Russian warheads, turning it into electricity. 10 percent of American electricity comes from decommissioned warheads.