Our paper entiled "Topology optimization of the volume-to-point heat conduction problem at micro- and nano- scale" was published on Acta Physica Sinica [李含灵, 曹炳阳. 微纳尺度体点导热的拓扑优化. 物理学报. 2019, 68(20): 200201; http://wulixb.iphy.ac.cn/CN/abstract/abstract74823.shtml]. The paper was selected as hot, frontcover, and best paper of the issue.