In Put Your Giving Where Your Mouth Is, Zack tells the story of how he came up with an idea to help rivals work together for charitable causes. Have you ever felt like the other side isn't doing enough on the issues you care about? If you disagree with your rivals on something and you know the data will prove you're right, tell your rivals to Put Their Giving Where Their Mouth Is! A charity that both sides like is guaranteed to win and one side will win more money at the end of the challenge.