The Epstein-Barr virus activates specific T cells in the immune system, causing an attack on nerve cells in the brain and spinal cord.Credit: Steve Gschmeissner/Scientific Photo Library For years, a common virus has been implicated in the development of multiple sclerosis, a disease in which the body’s immune system attacks nerve cells in the brain
the problem Dear Nature, I’m a PhD student whose research involves euthanizing healthy mice, usually via cervical dislocation, which basically means breaking the animals’ necks as quickly and painlessly as possible. I love my field and knew that working with animals would be part of my job when I started my PhD. I try to
In 1996, cryobiologist Gregory Fahy walked into his doctor’s office and got a monthly supply of growth hormone. Your hope, reinforced by a single study in rats1was that the injections would help him grow his thymus, a peculiar immune organ that atrophies and virtually disappears as people age. Regenerating it, Fahy thought, would help it
Analyzes of the scientific evidence led doctors to recommend that babies sleep on their backs.Credit: Yamaguchi Haruyoshi/Corbis/Getty Beyond Credibility: How Evidence Shows What Really Works Helen Pearson Princeton University. Press (2026) Consolidating the use of evidence in health and public policy has required decades of challenging work. Fifty years ago, doctors used to think that
Posting studies to preprint servers like bioRxiv is common practice in many scientific fields.Credit: Michael Szebor/Nature The central conclusions of biomedical preprints rarely change after peer review in a journal.1according to a study published on the preprint server bioRxiv this month. The research also found that studies that first appeared as preprints are retracted at
Researchers are trying to produce human sperm (shown here in a colored electron microscope image) from stem cells in the laboratory.Credit: Juergen Berger/Scientific Photo Library It sounds like science fiction: collecting blood cells from a person, engineering them to eventually develop into immature sperm, and then incubating them in a small sac grown in a