How to clear "last" command in terminal?

I've searched Google and been unable to find an answer to this. I use terminal heavily and when I use the command "last" I get hundreds of my logins over the course of the past 3 years. This is really obnoxious to scroll through when I'm looking for when my kids logged in a day ago. Does anyone know a command to reset this so the next time i enter "last" I will have a nice fresh blank log? Appreciate any help.

 

hmm that's interesting. i am running leopard currently. thinking about snow leopard but i have some classic apps that I need to run so I'm gonna wait. appreciate the help.

 

ty ty. I was using the man pages form OnyX for last, and for some reason last wasn't coming up there. Idk why I didn't think to just use man pages from terminal. Silly me.