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Von Neumann Probe

It's hard to create a list of all the scientists in the history of mathematics and physics who better applied theoretical knowledge into the hardware that ultimately worked and moved the world to the next step of existence. But if we try to do it, John von Neumann would be among the top five in the list of scientific GOATs. Probably the best of all of his contributions is in the history of computer science - along with Arthur Burks and Herman Goldstine, he published a paper* in 1946 that practically described the architecture of a modern computers as we are familiar with today. However, what he will be most remembered for is not a machine in existence today but one that is still just a theoretical and basically only an idea. Not yet anyways. In short, design of a von Neumann probe or a self-replicating spacecraft is not that far-fetched from all what we know today and if humanity sees its survival on Earth difficult in the future (to say the least) and tries to became interste