WNC Skill (Notes)
Despite a more-or-less common language, there are several disparate cultures living across the wasteland. Simple concepts may be passed on without a check, but more complex discussions require a cultures roll...
All existing cultures foci may be taken (taking the assumption they do still exist, and characters who take them must have some access to pre-war info about them) but will probably be of little use.
In addition add the following cultures:
Vault-Dwellers (incl. Brotherhood of Steel)
Tribesman (incl. Beastlords)
All these cultural groups are considered to have a DC modifier of -5, and checks defined as 'simple' require no roll, as they do speak the same language, merely having disparate slang, body language and societal attributes.