Ever had an annoying yet catchy song stuck in your head? Blame your right anterior temporal lobe. A study investigating the physical and cognitive changes to the brain resulting from different forms of dementia has pinpointed this thumb-shaped region of the brain as the location of well-known songs and melodies.

Tiny robots, called nanobots, may one day be able to propel themselves through the human body during the diagnosis and treatment of disease, thanks to the development of carbon nanotubes recently reported in an October issue of Science. Researchers from the Intelligent Polymer Research Institute at University of Wollongong in Australia have developed an artificial muscle that gives the nanobots their own power source and greater mobility during their journey throughout the body.

A recent study from the University of South Australia has suggested that adolescents who go to sleep and wake up later are at higher risk of becoming obese.The study, published in the October 1 issue of Sleep, compared the weight and free-time activities of 2,200 young Australians between the ages of 9 and 16. Adolescents who both went to bed and woke up late (termed "late-nighters") were 1.5 times more likely to become obese. The body-mass index (BMI) scores of late-nighters was found to be higher (0.66 vs. 0.45) than those of kids who both went to sleep and got up early (termed "early-risers").