一种以原子核跃迁为频率基准的钟，终于在实验室里运行起来。2026年10月7日，《自然》发表了两项独立研究：清华大学丁世谦及合作者与维也纳工业大学Thorsten Schumm与德国联邦物理技术研究院 Ekkehard Peik 等研究者，分别构建出基于钍-229的核钟，并成功实现了稳定的闭环运行。两组都让激光频率接受原子核的持续校准，完成了从测量核跃迁到运行核钟的关键一步。[1，2] “这是计量学 ...

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The human body begins with a single fertilized egg formed by the union of a sperm and an egg. As the fertilized egg ...

C.H. Waddington’s powerful image of embryonic stem cells specializing on a rolling landscape has captivated biologists since the 1950s. Experimental data is finally confirming, and complicating, his ...

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For decades, scientists have believed that a protein called interferon tau (IFNT) is indispensable for pregnancy in cattle.

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Column No. 181, Drawing the "Material Universe" and the "Spiritual Universe" on a Single Sheet of PaperConsidering the Three ...

The FDA has approved atezolizumab with chemotherapy after surgery for stage III colon cancer with deficient mismatch repair, ...