We started offering a significant discount ($75) for referrals (for kids taking our live online LEGO engineering classes (https://www.ascendly.com/online). We thought kids will really like taking classes with their friends, and the discount is significant enough to provide a strong incentive. And from our perspective, we think it will make for a happier student group. Today, we got our first referral/friend sign up. So, this a great data point and makes us think about how we can do more friends-taking-a-class stuff.