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Q&A Rigorous Science Meta
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Q&A The feasibility of Grey Aliens?

I want to write a science-based story which includes grey aliens. To clarify, grey aliens are seen to be either shorter or taller than the average humans, and sport a bulbous like head. their hea...

5 answers  ·  posted 5y ago by Pierre ‭  ·  last activity 5y ago by Pierre ‭

Question biology evolution aliens creature-design