/sci/ - Science & Math

Every person in the world, gets a letter, which materialises before their own eyes, from thin air. It explains in their language that this is god and stuff and predicts what happens in future at certain hour that day in their life (a lamp breaks or something) or it mentions something from that persons past, that only he knows. Now, of course some kids and people who can't read would be left out, but if 6 billion people received the letters, I think there would be no doubters.
But who are we kidding here? There is no god.

How do you reason someone who commits every logical fallacy, and cannot listen to arguments?

Ik someone who is a flat earther and every point I make all they do is shift the burden or just spit ad hominems saying I don't have eyes to see although I've actually considered what they've said.

>Mfw I have ears to hear
>Mfw I have a brain to analyse

Vitamin D.. does the sun produce it through sunlight?
or does your skin produce it when it is hit by sunlight?.. chemically? how does it work?