There's still a flat earther society out there too -- not only do they deny the moon landing, they are convinced the earth is flat.
Too bad there isn't a biological connection to facts. People being free to believe any old thing results in more chaos over time. And no, humans shouldn't force humans to stop believing in some things... I'm just dreaming of a tie between reality and biology.
For example, no sane female could possibly not beleive that females give birth after being exposed either directly or indirectly to the biological reality.
It's too bad that we can't tie other 'facts' of our world to our physical entities in the same way -- like, you know, the vast majority of us believe we have to be able to breathe air in order to live ;0