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Exposure to non-relational trauma, such as serious accidents, war or life-threatening illness, is linked to poor mental and physical health. Its relationship with biological ageing markers, however, remains underexplored. This study's aim was to examine associations between non-relational trauma and multiple biological ageing markers, and to assess whether associations vary by trauma burden, trauma type and sex. We analysed UK Biobank data from 152,863 participants (mean age = 56.4 years; 56.5%...

Epigenetic remodeling is a hallmark of aging, yet which epigenetic layers are most affected during aging-and the extent to which they are interrelated-is not well understood. Here, we perform a comprehensive analysis of epigenetic aging encompassing 6 histone marks and DNA methylation measured across 12 tissues from > 1000 humans and mice. We identify a synchronized pattern of age-related changes across these epigenetic layers, with all changes converging upon a common set of genes. Notably, an...

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