Anu is a Features author at Android Police. You'll find her writing in-depth pieces about automation tools, productivity apps, and explainers. Before joining AP, she used to write for prominent tech ...

A sinus arrhythmia refers to a problem with the sinus node of the heart. This controls the rhythm of the heart and can be fast (sinus tachycardia) or slow (sinus bradycardia). This article looks at ...