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BEES 2.0

That may never have happened, but the notion was immortalized by Charles Dickens inside stories with the orphan boy, Oliver Twist, who was simply sold with a chimney sweep.  CCTV cameras and machines that generate smoke in order that testing and surveying of the chimneys is possible properly.  If enough of it accumulates and becomes hot, it can a fire to get rid of out in the chimney.