How to promote wound healing; “Enhanced Games” will feature athletes leveraging latest performance-enhancing drugs; Sophisticated blood test predicts Alzheimer’s decades before onset; Large trial demonstrates lifestyle key to dementia prevention; Pulse oximeters found unreliable in dark-skinned individuals; Can vertigo be a symptom of menopause? Gut bacteria support resistance to respiratory viruses; Riddle me this—sky-high cholesterol on a vegetarian diet—but zero plaque!