Coffee Joulies - cool coffee faster

I know what my wife's Christmas gifts are going to be this year. She, admittedly, likes her coffee pretty hot, so I don't know whether that will be the prefect temperature for her, but the science is outstanding.

And that's what matters, right? Whether I find her gift interesting, right?

The Coffee Joulies are filled with a phase changing material that has a transition temperature at whatever appropriately hot coffee is supposed to be. Hopefully it's right.