not-yet-known not-yet-known not-yet-known unknown Think while screening: From routine screening A paper in Science Instantly I became a photobiologist (random outcome ). Experiments with the Gilvocarcins led to collaborations with FDA scientists who had a monochrometer, and was a prelude to my employment there. This led to all sorts of interesting (and fun) experimental options, including action spectrum on a plate (below) (Elespuru and Hitchins 1986) (Figure 1).