National Geographic has an amazing interactive look at the brain, heart, digestive system, lungs and skin. You can stimulate the brain with a variety of inputs and see what part of the brain reacts. The heart can be “put through the paces”, the digestive system fed, and the skin aged. You can even trigger an asthma attack in the lungs. Each section looks at anatomy, function, and ills. This could be the centerpiece of some great student-centered exploration in a health or science class.