AnimalsMind-BlowingMost mammals, regardless of size, have hearts that beat approximately 1 billion times over their lifetime.1972k
AnimalsMind-BlowingSharks can detect fish heartbeats using electroreceptors called ampullae of Lorenzini that sense electrical fields as small as five billionths of a volt.401k
AnimalsMind-BlowingA killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.321k
BodyMind-BlowingDuring a typical human life span, the human heart will beat approximately 2.5 billion times.27836
BodyMind-BlowingThe human testicles produce around 1,000 sperm cells every second — roughly 1,500 with each heartbeat at rest.194k