I’m sick of hearing about peanut recalls. Aren’t you? Well, it turns out that nothing in this bright world of ours is safe from contamination — not even potatoes. The culprit? A wiley little bacteria called listeria. You know, the same pathogen they use to frighten us into cooking all our food. Everything must be cooked, say the food scientists. Nothing consumed raw. No raw milk. No raw vegetables. No soft cheeses. No sushi or smoked salmon.