Our mood, metabolism and sex lives are dependent on the seasons, and now it seems, so is our immune system. In a study published today, British and German researchers find almost a quarter of human genes are more or less active depending on the season. The researchers say the discovery could help explain why people tend to be healthier in summer and diseases known to be seasonal such as cardiovascular disease and rheumatoid arthritis are more evident in winter. "It helps expl

Ultrasound scans are very useful for peering inside the body; using high-frequency sound waves, doctors can create images of various organs to detect problems, or monitor developing babies in the womb. But it turns out that ultrasound scans may have another, rather unexpected use in medicine: They may help treat Alzheimer’s disease. In a new study, scientists found that scanning the brains of mice with a model of this disease not only helped clear the abnormal protein build