Prof. Richard P. Feynman gave a visionary lecture at CALTECH in 1959 during the annual American Physical Society meeting:- Title

There is plenty of room at the bottom

Where he spoke about the power of manipulating materials at a small scale. Which is almost true now in modern Science and Engineering.

A decade later, Professor Norio Taniguchi coined the word nanotechnology- manipulating materials or engineering at the nanoscale (1-100 nm).

A molecular nanotechnology scientist Dr Eric Drexler in 1986 published a book           Engines of Creation: The Coming Era of Nanotechnology 

He suggested that self-replicating nano-robots, designed to build new replicas of themselves atom by atom, might run amok and remake everything in their image, reducing the world to a grey sludge of intricate but pointless little machines. To Joy, such prospects might warrant our refraining from some areas of research. 

The National Academies of Sciences, Engineering, and Medicine, in its 2006 review of the National Nanotechnology Initiative, argues that it is difficult to predict the future capabilities of nanotechnology.

Now in 2022, every common person is aware of the power of such engineered self- replicating machines- Corona Virus

Nanotechnology: The art of nature, A precision engineering at small scale (1-100 nm), which Nature follow in their designing.