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Q&A Ways to make an alien viral plague scientifically hard?

Aside from resorting to a grey goo-ish nanoplague that kills indiscriminately regardless of biochemistry, how might an alien virus, bacteria or other pathogen still be dangerous to humans? Could a ...

3 answers  ·  posted 8y ago by Z.Schroeder‭  ·  last activity 8y ago by Z.Schroeder‭

Question biology bio-mechanics chemistry xenobiology biochemistry