The orange juice that many people like to drink with breakfast is naturally high in sugar. But it also contains citric acid, ...

"Hydroxyapatite is natural. It is a type of calcium that makes up bones and teeth," says Lai. "Nano-hydroxyapatite relates to ...

And the 'refuse to believe' part in this case is not that they actually don't believe it. It's more that the fact is so outlandish or ridiculous that it just blows their mind.