Just wanted to thank you for coming up with a fun and creative way to learn about trucks. Our 2 year old son watches it about twice a day and has really started to notice the difference between the trucks and what they are used for. We love the dvd and t-shirt. I do not know how you can up with all the lyrics, some of those are very good and educational. Thought you might want to know what a great impact this is making on young boys just like my son. He can’t live without it.