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If someone designs a device with a very small size with the idea of ​​designing these machines, who knows what they can do? Imagine two micromachines—one that is similar to existing machinery and the other that is brand new—that have received widespread attention. The former is a nano-scale submarine with a scale of only a few billionths of a meter - which is about the length of tens or hundreds of atoms. This machine, although controversial, can be applied in medicine. You can walk through the blood, look for sick cells and kill them.
The second type of machine, the so-called assembler, was a more radical idea, which was proposed by futurist K. Reic Drexler. This machine has no similarity to macroscopic objects (this is a very important fact considering its ultimate practicality).
It will be a new type of machine - a universal manufacturer. It can make any structure, including itself, through atomic-scale "grabbing and placement": a set of nanometer-scale pliers will grab a single atom from the environment and place it in place. Drexler's vision heralds that society will change forever because of micro-machines that can make a TV or a computer in a matter of hours without paying a penny. However, it also has a dangerous side.
The potential of the assembler to self-replicate led to the possibility of so-called “gray stickinessâ€: countless self-replicating nano-assemblers created countless copies of themselves, a process that destroyed the planet.
Does the idea of ​​nanoscale machinery make sense? Can they be made? If so, can they be effectively scaled down compared to the larger "cousins"? Or do they work through different rules? In fact, will they destroy the earth?
The past and future of nanomachines
Of the results promised by nanotechnology, micromachines are always very compelling. Their appeal is straightforward. Large machines - airplanes, submarines, welding robots, toasters - are undoubtedly very common.