One simple screening tool for cognitive impairment is the clock-drawing test (CDT): the patient is provided with a printed ...

Every GPS satellite carries a correction baked into its software. Einstein’s relativity says clocks tick faster in weaker gravity, and engineers had to account for that before satellites could ...

Summary: A comprehensive analysis of biological clocks across the human body reveals that both insufficient and excessive sleep are associated with accelerated aging in nearly every organ system. The ...

Aging is a complex process, and precisely measuring how the human body declines has long been a challenge. Two people of the same chronological age can have very different health trajectories.