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).

In the northern hemisphere, the vast majority of tornadoes (more than 95 percent) rotate counter-clockwise–the same spin as a low pressure system. At low levels, air spirals into a tornado in a large ...

Tornadoes do occur in the Southern Hemisphere, albeit at a greatly reduced frequency than in the Northern Hemisphere, primarily because it includes the U.S., which hosts about 75 percent of the ...

Winds always rotate in a counterclockwise sense around hurricanes in the Northern Hemisphere. Winds in tornadoes usually rotate counterclockwise, but in perhaps five percent of tornadoes, clockwise ...

Spiral galaxies imaged by JWST that rotate in the same direction relative to the Milky Way (red) and in the opposite direction relative to the Milky Way (blue). The number of galaxies rotating in the ...