by Elio — In 1956 I joined Ole Maaløe's lab­o­ra­tory in Copen­hagen for a two year post­doc. We worked on the con­nec­tion be­tween the rate of growth of Sal­mo­nella and its macro­mol­e­c­u­lar com­po­si­tion, ar­riv­ing at the con­clu­sion that there was in­deed a sim­ple lin­ear cor­re­la­tion be­tween the cells' nu­cleic acid and pro­tein con­tent and how fast they were grow­ing. In try­ing to in­ter­pret this, Ole was...