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Melting ice solves leap-second problem — for now
THE TOPIC IN BRIEF • Timekeeping is determined by ultraprecise devices called atomic clocks, but it is also aligned with Earth’s rotation, mainly for historical reasons. • Because the planet’s rate of rotation fluctuates, this alignment is maintained with the occasional addition of ‘leap seconds’ to the official time standard. • Now, Earth’s rotation seems […]
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Les… 28 Mar 2024 Le déploiement des technologies hydrogène au regard des objectifs… L’hydrogène vert représente un marché à fort potentiel. La France, pour sa part, a décidé de consacrer d’importants investissements à ce vecteur incontournable de… Source link
Depleting myeloid-biased haematopoietic stem cells rejuvenates aged immunity
Morrison, S. J., Wandycz, A. M., Akashi, K., Globerson, A. & Weissman, I. L. The aging of hematopoietic stem cells. Nat. Med. 2, 1011–1016 (1996). Article CAS PubMed Google Scholar Rossi, D. J., Jamieson, C. H. & Weissman, I. L. Stems cells and the pathways to aging and cancer. Cell 132, 681–696 (2008). Article CAS […]