Human Experience Bonus Option

Some Game Masters find that the standard 10% bonus to earned experience for Human player characters is not enough to encourage people to play as Humans. If you feel that this is the case in your campaign, there is absolutely no reason not to give double that bonus. Because of the exponential (doubling) nature of the character advancement tables from 1st to 9th levels, giving a larger bonus will not significantly unbalance your game in any way.