2 simple questions

[mcales]

I have read that you are only suppose to play 15% of hands... what exaclty does this mean? Only play 15% through to the river or does that include just seeing the flop?

I ask because my "flops seen" is usually around 30-35% and I feel like im playing mostly only strong hands. Perhaps this is just a huge leak in my game?

And what is this VP%IP number mean that is frequently mentioned?

thanks