i haven't read all the suggestions so bear with me if this has been suggested before : "research for different unknown chemicals. There could be 10 different ones or so. then what i think PTforWindows suggested : a description of what that chemical does after the player has succeeded in using it. AND what it does if it fails and there could be different types of failures for one chemical. A money bonus (varying in price depending on the chemical's level) after each success would be nice too!