All vibration harvesting has been a commercial failure. Will the triboelectric nanogenerator TENG version succeed? First commercialisation has been triboelectric air filters. Why, where, next improvement? Which of the four harvesting modes are useful for what and where is the best work? See new infograms, graphs, timelines rather than equations. Why are fluoropolymers 55% of electro-negative materials used - a challenge and an opportunity? Next?