I absolutely loved Exploratorium. It is a fantastic tool. I researched proprioception. Exploratorium has a great video of proprioception and a correlated experiment for students to test their own proprioception. This tool is extremely useful for classroom activities, laboratory activities and general class discussion. When students "experience" the lecture, it aids comprehension and overall understanding. The website also offered descriptions to have your class rebuild the circulatory system as a class activities or laboratory activity. I love this hands on stuff. It is so integral to understanding. What a great resource. I am so grateful for this suggestions! Thank you so much!