This site is not for profit. However, because I have spent hours upon hours perfecting this unit and spending hundreds of dollars on software, I am asking for a small fee of $10 per teacher, which includes his/her students, to use this unit. It is a small compensation for the time it will save you and the pleasure it will provide your students. Please do not freely share this unit with your colleagues. If they want to purchase this unit, they can visit this site. Under no circumstances do you have permission to share this lesson online. I hope you can understand why I am discouraging those who purchase this unit from freely providing the resources to other teachers. Thanks again for your purchase!