Right- or left-hand rule?

A story in the February 2011 issue talks about how Andreas Moll “walked the crowd through the right-hand rule” during a particle physics slam, but the picture on page 7 shows everybody using their left hand. What's the deal?
Jonathan Link, Virginia Polytechnic Institute and State University

The editors respond: You're not the only astute reader who noticed this!  We contacted Moll, who said he was in fact demonstrating the right-hand rule using his left hand. The purpose of the rule is to show which way charged particles—in this case, electrons forming an electrical current—flow in a magnetic field. Either hand works. When you use your right hand, your thumb points in the direction the electrical current is coming from; when you use your left, it points in the direction the current is flowing.