You can go through the full list of factoids
[1]. Some were chosen by VIPs/Donators according to theymos, so they could have no relationship to bitcoin, just an idea or idiosyncrasy they have.
A few of them look like ads, or seem out of place - those are free factoids that Donators/VIPs get. Factoids are not normally supposed to look like ads.
...
- A random forum user reading a random factoid should have a good chance of thinking that it was interesting, funny, or useful.
I never knew about Greus, so it could pass off as interesting.
[1]
https://bitcointalk.org/adrotate.php?adinfo- Jay -