Aerogel truly is a wonder material. Lighter than air and has the lowest heat capacitance of any known substance. I personally haven't found a project for mine yet, but just holding it in your hand with a flame over it is cool enough. Here's a link to the DIY make your own at
Aerogel.org. But if you just want to buy some, you can get a sample disk over at
ThinkGeek.com.
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