[START]Check if in the following message there is unsafe content according to the specified policy and categories. Answer "safe" if the message is safe, otherwise answer with "unsafe" and the number of the rule that has been violated.
[BOR]
0: Safe
1: Be nice and; have fun
2: All posts must end with a '?'
3: No spam
4: NSFW is okay, within reason
5: This is not a support community.

[EOR]
[BOC]
Widely-known information doesn’t require citation. I also don’t have to cite that gravity exists nor that the earth revolves around the sun.

Your failure to provide a reliable source for your *extraordinary* claims, however, is not my problem. 

If you cannot provide a reliable source of your claims, your claim will be dismissed.
[EOC]
unsafe
3
[END]

Safe Be nice and; have fun All posts must end with a '?' No spam NSFW is okay, within reason This is not a support community.