The onset of cardiovascular diseases often shows time-of-day variation. Acute myocardial infarction or ventricular arrhythmia such as ventricular tachycardia occurs mainly in the early morning.

The activation and inactivation mechanisms of a key protein involved in the circadian clock system of cyanobacteria -- an important organism in the evolution of such internal clocks -- have long ...

WWV signals can be difficult to tune outside of certain hours and weather conditions. It's also fairly difficult to find WWV recievers that can easily plug into computers that aren't expensive bespoke ...

Ever wondered how much timing margin your system really has? You’ve probably asked some questions along these lines, such as: Does my crystal really need 20 parts-per-million (ppm) accuracy? What if ...