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Granular materials densify under repeated mechanical perturbations, nonequilibrium dynamics that underlies many natural and industrial processes. Because granular relaxation is governed by frictional contacts and energy dissipation, this aging behavior fundamentally differs from that of thermal glasses despite their apparent similarities. Here, we uncover how friction controls the compaction dynamics of granular packings subjected to quasistatic cyclic shear. Using discrete element simulations,...

Partial reprogramming has emerged as a promising strategy to reset the epigenetic landscape of aged cells towards more youthful profiles. Recent advancements have included the development of chemical reprogramming cocktails that can lower the epigenetic and transcriptomic age of cells and upregulate mitochondrial biogenesis and oxidative phosphorylation. However, the ability of these cocktails to affect biological age in a mammalian aging model has yet to be tested. Here, we have characterized...

The geroscience hypothesis suggests that understanding mechanisms underlying aging will enable us to delay and lessen age-related disability and diseases. The role of mechanical factors has been increasingly appreciated in many aspects of the aging process. Here, we use mouse models to investigate changes in the biomechanics of the proximal pulmonary artery, lung function, and right ventricle function in aging. We found an age-related decreased capacity to store energy and increased...

Blue manakins in Brazil use “disruptive camouflage” to protect their eggs, new study finds

Science chats with an ecologist about the advantages of using discarded carcasses for research

But lawmakers reject Trump’s call for deeper downsizing and boost applied and medical research

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