• Mice with a disrupted circadian rhythm gene overeat and develop problems related to obesity, suggesting that in mammals the 24-hour clock cycle is finely tuned to metabolic functions.
    Science Express, April 21
  • Elderly nursing-home residents often are not given sleeping pills, for fear that the compounds will increase the risk of falls. Ironically, a study finds that insomnia itself, not sleep medication, predicts future falls.
    Journal of the American Geriatrics Society, March 30 online
  • Soft organic tissue apparently survived in a fossilized leg bone of a 68-million-year-old Tyrannosaurus rex—a surprise because organic molecules should last only 100,000 years. If truly original tissue, the material may hold recoverable genetic data.
    Science, March 25
  • Farmed salmon seem able to spread potentially lethal parasitic sea lice to wild cousins more readily than previously thought—sometimes out to 30 kilometers from a farm only 200 meters long.
    Proceedings of the Royal Society B, March 30