Explorelearning.com Rocks!

Hi all, The more I teach Physics and Mathematics the more I appreciate the learning objects (Gizmos) made by Explorelearning.com. They are simply the best. My students love to use them. I used one to test my son's hearing tonight. I feel he has good hearing and this gizmo assured me that it was. But I did use it in a class today and I discovered a student with some hearing impairment. He could not hear below 500 Hz or above 8000 Hz. In fact I tested better than he did. But I have 2 pet peeves: 1. They don't make enough new content every year. 2. They don't sell their content separately for mobile or Learning Management Systems (such as D2L, Blackboard etc).