Discover the only planet in our solar system that rotates clockwise. Learn why this 'rebel' planet spins backwards, how a ...
In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).
BALTIMORE, Feb. 18 (UPI) -- U.S. astronomers using the Hubble Space Telescope say they've precisely measured, for the first time, the rotation rate of a galaxy. Based on the clock-like movement of its ...