This is an extremely tiny mod that I made in about half an hour in the GECK, and is also my first mod for any Bethesda-related game, so that's neat. What the mod does is very simple, which is add about a paragraph and a half of additional lore about the wasteland and expanded backstory on the initial Vault 101 scouting party to the Overseer's terminal. The additional text mostly discusses the existence and a brief overview of the "raiders" and the use of bottlecaps over dollar bills as standard currency in the wasteland. That's it, nothing more and nothing less, since all it does is edit the text for an existing note entry and not add anything new whatsoever, it should be compatible with everything, even vegaswanderer's mod that lets you download all of the notes on the Overseer's terminal to your Pip-Boy: https://www.nexusmods.com/fallout3/mods/22134.

Why did I make this? Well I always found the fact that your character instantly knows the common currency used by everyone in the wasteland is bottlecaps of all things to be a little immersion breaking, it's never explained in any way to him/her prior to entering the wasteland nor in it before the time to start trading at merchants and Lucas Simms telling you the reward for disarming the Megaton bomb comes. As for the inclusion of information about raiders, how does your character already know the first raider they come across is a hostile, apart from your omniscient compass telling you they are? Sure, they always shoot at you as soon as they see you, but what if you see them before they see you, omniscient compass aside the only thing you have to go on as for why you should should kill them without any mercy is the fact that they don't look very friendly. If that's a good judge on who we should be shooting on sight then most of the people living in the wasteland should be fair game as well.

For a lot of people this probably doesn't mean anything, but for people who care about immersion and/or roleplaying their character it can be jarring, at least for me anyway. These two factors of the wasteland didn't get a proper introduction in this game, in New Vegas your character is assumed to have already been an active member of the wasteland for at least a good part of their life so they don't need one, and in Fallout 4 you can directly ask one of the people in Abernathy Farms right outside the starting vault about what they mean by "caps" and "raiders". These terms would be alien to someone right out of a vault, so it makes so much sense for these to be early dialogue choices, that's something I really like that Fallout 4 did so I wanted something akin to that in this game as well, I haven't played Fallout 1 and 2 yet so I can't say anything for those games.

I pretty much made this mode for myself, but since it's so tiny and was so easy to make, I decided to release it for other people to download and use as well. Hopefully at least one other person feels the same way about this as I do and get's some use out of it, or at least it's one of those "I didn't realize this was a problem until someone else pointed it out" type things.

Installation:
Either download it with your preferred mod manager or manually install it, extract the .rar and place the .esp file in your Fallout 3 Data folder.