Physicists have developed an amazingly simple device that allows heat to flow temporarily from a cold to a warm object without an external power supply. While the process appears to contradict the laws of physics, it's based on thermal oscillating circuits

See the source article by following the link below:
Physicists have developed an amazingly simple device that allows heat to flow temporarily from a cold to a warm object without an external power supply. While the process appears to contradict the laws of physics, it's based on thermal oscillating circuits