Would you buy these magic beans?

What do these stainless steel coffee beans promise to do?  The creators of “Coffee Joulies” claim that you can drop a couple in your coffee and it will quickly cool your hot cup of coffee to a drinkable temperature.  They work by absorbing the heat of the coffee.  Then when your coffee starts to cool they give up the heat and keep your coffee warm.  Sound amazing?  I’m not sure.  They are reusable and currently cost about $30 for a bag of five if you buy them on the Kickstarter website.

What do you think?