function ENT:Use( activator )
    if( self:Getexperience() == 0 ) then return end
    if( activator:IsValid() and activator:IsPlayer() ) then
        activator:addXP( self:Getexperience() or 0 )
        self:Setexperience( 0 )

        if self.Charges <= 0 then
            activator:ChatPrint("You have finished reading "..self:Gettitle().."!")
            self:Remove()
        else
            activator:ChatPrint("You have read a few chapters of "..self:Gettitle().."!")
        end
    end
end