Sunscreen hasn't been invented yet. According to this contemporaneous view of reality, the sun is good for you, tanning is good for you. Never heard of it. And if we've never heard of it we can reasonably argue that it doesn't even exist. Facts are opinion.
Opinion is presented as fact.
That's my opinion, and that's a fact . If you give people a fun new way of expressing the same old thing, they often take it as a gift, and may be inclined to respond in kind. Suppose you wanted to bum a cigarette. The good will you earn by stating your desire in a original terms is often enough to grease the skids of compliance. Where's the public toilet, say.