1. Bearing
Small ball bearings provide the movement of drive shafts, are used in conveyor systems, and in general, are used in almost every moving mechanism. Many attribute the primacy of the idea of the bearing to Da Vinci, and it is not unreasonable, since in his notebook there was a model of a part with a description and notes. And many other ingenious devices of the scientist, albeit not implemented, already provided for the use of a bearing in the model. Unfortunately, in the 15th century, the attitude towards scientists was the same as now: the lack of subsidies for amazing inventions, misunderstanding on the part of the crowd, a desire to hide ingenious developments by higher authorities. It is a pity that the thinker did not have enough independent resources to implement projects, otherwise, he could really change the world!
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