Billionaire and Tesla CEO Elon Musk has made headlines with dire warnings that declining birth rates are an “existential crisis” for humanity. The threat might be even more dire than Musk (the father of at least 14)...

Subtle facial gestures linked to the body’s fight-or-flight response could be used to help diagnose people with tinnitus, a new study says. Video recordings showed that people with tinnitus experienced facial twitches and pupil dilation in response...

People whose bodies are aging faster could be more likely to develop dementia than those with normal or slower aging, a new study says. Folks with advanced biological age are about 30% more likely to develop dementia,...