Scientists can be wrong 
Not Vaccine scientists
Nor Climate scientists
Just astronomers doing astrology 
The Captain
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They need to check what is in that cup BEFORE they drink it…
You are right; they can be. That is one of the things that differentiates them from theologians, pundits, and conspiracy theorists. Scientists try to fit their understandings to the facts versus ignoring the facts that do not fit their beliefs.
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