Neuroscience

Study probes 'covert consciousness'

Ricardo Iriart last saw his wife conscious four years ago. Every day since, he has visited Ángeles, often spending hours talking to her in hopes that she could hear him.

Genetics

Why important genes 'go quiet' as we get older

The human gut renews itself faster than any other tissue: every few days, new cells are created from specialized stem cells. However, as we get older, epigenetic changes build up in these stem cells. These are chemical markers ...

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