It was hard to believe that Monday morning’s introduction to the Italian writer Primo Levi on Radio 4 lasted for only 15 minutes. It was so rich, multi-layered, filled with meaning. Presented by Janet Suzman, it was intended as a fanfare for the 11-part adaptation of Levi’s most original book, The Periodic Table, in which he explores the chemical elements by equating them to episodes in his own story.