While learning about heat and thermal imaging today, one of my students quipped "My iPad has an app that takes those kinds of pictures."
"Hey, MY iPad will do that too!" I said. (Good thing I had a kid there to remind me of that app). So, of course an impromptu experiment began. We took thermal images using PhotoBooth and showed them on the document camera. Then I had the kiddos rub their hands (same kids from this post) together and snapped a picture real quick to see what color their hands were. Then we compared the colors in the pictures to this scale from NASA's website.
Yet another use for iPad in the classroom!