It is one of the humans' desired goals that we want to precisely control the heat transport as the level as that we can control the electrical current. However, a high-performance thermal rectifier or thermal diode is still missing. Currently, researchers at the Japan Advanced Institute of Science and Technology (JAIST) have demonstrated a promising asymmetric graphene nanomesh device that shows a high thermal rectification ratio at low temperatures. The experiment provides a practical guideline for developing a high-efficiency thermal rectifier based on graphene nanomesh structure. The findings are published in Nano Futures.