The math that describes the branching pattern of trees in nature also holds for trees depicted in art—and may even underlie our ability to recognize artworks as depictions of trees. Trees are ...

Trees in nature follow a “self-similar” branching pattern called a fractal, in which the same structures repeat at smaller and smaller scales from the trunk to the branch tip. In the new study ...

This ECG has a narrow QRS complex initally, then a fast heart rate, regular rhythm and no identifiable P wave activity which suddenly turns to a wide complex in a left bundle branch block pattern.

On this ECG, the, QRS complex has runs of wide-complexes in a left bundle branch pattern. The heart rate is quite fast (about 250 beats per minute). If you look closely, there is "AV dissociation ...