'How old are you?' 'Forty-four.' 'Were you in Rwanda in 1994?' 'Yes.' 'Were you a member of Interahamwe?' 'It was a long time ago.' 'I will ask again, ' I hissed near his ear. 'Were you a member of Interahamwe?' He looked up to me. His breath smelled terrible. I almost felt nauseous. 'Yes, I was there and I was killing Tutsi cockroaches. They deserved to die.'This is a story about a Geneva-based Coltan trader being drawn into the Congolese conflict...