Physics bans cloning

It is impossible to make an exact copy of any object, living or not.

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Lamas-Linares, A., Simon, C., Howell, J. C. & Bouwmeester, D. Experimental quantum cloning of single photons. Science 296, 712 - 714 (2002).
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Authors

Philip Ball
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Ball, P. Physics bans cloning. Nature (2002). https://doi.org/10.1038/news020520-1