I spend a fair bit of time asking folks if they know where or when someone said something. A database might prove helpful. I recall watching TV as a kid where an animal rights activist protested the use of animals but suggested that mentally handicapped humans might serve in their stead. The criteria was awareness, if a monkey showed awareness but a human didn't then... I have met one person who watched the same programme but without dates and the name of the programme it is inadmissable.