english: Almost all projects of this kind fall apart within a decade because too many people drop out of the study, or funding for the research dries up, or the researchers get distracted, or they die, and nobody moves the ball further down the field.
non_english: Skoraj vsi projekti te vrste propadejo v enem desetletju, ker preveč ljudi izstopi iz raziskave, ali se preneha financiranje raziskave, ali raziskovalci študijo opustijo, ali umrejo in raziskave nihče ne nadaljuje.