My reference to the american continents is what in science is called a demonstration by analogy. What about dark matter ? Is that mental gymnastic ? This is pure rational and objective logic.

Prove me wrong on anything and I will be glad to reconsider my actual understanding of things. My goal is getting closer to the truth without making errors. Rejecting hypothesis whose validity is UNKNOWN is taking a risk of making an error. And this is what I don't want.