Got thinking of this because of an I Love Charts post: [url]http://ilovecharts.tumblr.com/post/33298830817[/url] That had a nice follow up from Shawn Cornally:[url] http://shawncornally.com/wordpress/?p=2997[/url] I had been making my own set: [url]http://mathhombre.tumblr.com/post/33397964130/scale-y[/url] And that was the start of this sketch. Basically I couldn't stop myself. I made a quick activity sheet to go with this: [url]http://mathhombre.blogspot.com/2012/10/3rd-degree.html[/url] Set the slider on the bottom right to choose your input in Kelvin, Farenheit or Celsius, then adjust temperature using that point. (The little triangle.) What do you notice as you change the temperature?