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).

The Sun's counterclockwise rotation (as viewed from its north pole) originates from the initial spin of the solar nebula, a remnant of the larger cloud from which it formed. The direction of this spin ...

I believe an error has been made in the description of the first electrocardiogram of Case 29–1965 of the Case Records of the Massachusetts General Hospital. Dr ...

Discover the mind-blowing science behind a screw that works both clockwise and counterclockwise. Learn how its unique design makes direction irrelevant and explore the fascinating physics behind it!