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Did anyone see the episode of Shark Tank a few weeks ago with the two guys that developed these items called Joules, that you use to regulate the temperature of hot liquids? Apparently, they are stainless steel shells in the shape of very large coffee beans and are filled with a phase change material that absorbs extra heat above (140?) and then keeps the liquid at that temperature for hours. I'm tempted to buy some to try.
Only thing is they are so large that they 1) displace significant liquid and 2) seem heavy that I'd worry about chipping/cracking the glass/ceramic cup.
Anyone?
Great thread(s) BTW! 
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