Studying twins is key to understanding the heritability of lifespan Halfpoint/iStockphoto/Getty Images In wealthy, relatively safe countries, how long people live now probably depends just as much on the genetic variants they inherit from their parents as on their environment and lifestyles. That’s the implication of a study reanalysing data from research in twins in…

Researchers tracked the body condition of polar bears in Svalbard Jon Aars, Norsk Polarinstitutt Polar bears have been getting fatter even as sea ice disappears in Norway’s Svalbard archipelago, the fastest-warming place on Earth – but scientists don’t expect the good times to last. The northern Barents Sea, which stretches between Svalbard and Russia’s Novaya…

Epstein-Barr virus is a very common infection, but that doesn’t make it harmless Science History Images/Alamy About 1 in 10 people carry genetic variants that make them particularly vulnerable to the Epstein-Barr virus (EBV), a ubiquitous pathogen that is increasingly being linked to conditions like multiple sclerosis and lupus. The finding, which comes from a…