This week This week It all began in 1948 when a biochemist found chickens fed a new antibiotic were growing faster than those without. SuperStock/getty FeatureLife Sciences How did antibiotics become part of the food chain? Drug resistance may spill over from livestock to people by Richard Conniff Feature Life Sciences Feature Life Sciences Sniffing out cancer by Kate Ravilious Elizabeth Finkel Dogs can do it, now new machines bring hope of earlier detection. News Life Sciences News Life Sciences Giant virus awakes from Siberian slumber by James Mitchell Crow Infectious power undiminished after 30,000 years. News Life Sciences News Life Sciences Implant takes the fight to the tumour by Philip Dooley Targeting system may reduce chemo side effects. Culture Life Sciences Culture Life Sciences Reviews: Giraffes, the human body and David Attenborough by Bill Condie A selection of recent books and television series. Feature Society Feature Society Portrait of the week: Anthony Goldbloom by James Mitchell Crow It's a great time to be a data geek. News The Future News The Future Editor's Choice: HIV, broken bones, lasers and dinosaurs by COSMOS editors A round-up from the scientific and technical journals.