20 Incredible Inventions That We Have Completely Lost

 Science always seems to be accelerating at an incredible pace, with new ideas fast superseding older ones. New concepts rely on previous ideas, gradually improving them and leading humanity step by step into a more certain future. However, the truth is much more surprising than this. Science moves in fits and starts - a step forward might be followed by two steps backward, or a stumble and fall into oblivion. 

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