The average heart beats 35 million times a year, 2.5 billion times over a lifetime. Those beats must be precisely calibrated; even a small divergence from the metronomic rhythm can cause sudden death. For decades, scientists have wondered exactly how the heart stays so precisely on rhythm even though it contains so many moving parts. Now, researchers at the University of Maryland, the University of … Continue reading Researchers identify protein responsible for keeping the heart beating on time.