It has been discovered that fulvalene diruthium (Ruthium is element #44 - and quite rare). Umm, let me start again.
It has been discovered that this rare molecule has a wondrous property - it can store heat! What does that mean? Everything can store heat! True, but this is different. This molecule can store heat and lock it away - the heat doesn't "bleed away". The heat is locked away chemically and stored in the chemical bonds as the heat changes those bonds. Then, to unleash that heat, a simple nudge is required and the heat is released.
So when winter comes to MN - and it will very soon - I could call my parents and ask them to send some of that Florida heat up to Minneapolis. If they had some of this stuff, they could just set it out in the sun for awhile, bottle it up, and send it to me. Oh joy.
Regretably, the Ruthium is quite rare. It is found along with Platinum. (Smart people would take the platinum and leave the Ruthium.) It is also a byproduct of the nuclear fission of Uranium. So it could be 'mined' from spent fuel rods.
Even so, it is exciting to have such a 'game-changing' technology possibly close at hand.