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).

Venus rotates clockwise, opposite most planets, a phenomenon called retrograde rotation. A day on Venus is longer than its year, and the sun rises in the west. Scientists believe a collision or ...

From space, the Iberian Peninsula – primarily occupied by Spain and Portugal – looks like an immovable solid block of land anchoring southwestern Europe. But beneath that apparent stability, the ...

The Iberian Peninsula is slowly rotating clockwise, scientists revealed in a recent study that sheds light on how the Earth is moving beneath southwestern Europe. Spain and Portugal have both suffered ...