From Michael Kellock
Not having read any Dan Brown novels, I wonder how his villain transported his 250 milligrams of antimatter to the Vatican. It brings to mind the problem faced by the inventor of the universal solvent: what to store it in?
Jeff Hecht writes:
• The obvious answer is unobtainium, the stuff that will do whatever it is you want it to do. The more serious answer is a Penning trap, which uses low temperatures and electromagnetic fields to store much smaller quantities of antimatter – see science.nasa.gov/headlines/y2000/ast29may_1m.htm
Foster, Victoria, Australia
