After tripping thrice on the stairs of Air Force One on Friday, President Joe Biden’s physical and mental health is back in focus, with experts deeming him unfit for the top office.
TEHRAN, May 23-The kilogram is no longer defined by a physical object -- starting Monday, the unit of measurement will be based on fundamental constants, atomic properties and physical absolutes.
TEHRAN, December 17 -People who get prompt physical therapy for pain in the knee, shoulder or lower back may have less need for opioid painkillers, new research suggests.