BodyMind-BlowingAn average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.1006k
AnimalsMind-BlowingA hedgehog's heart beats around 190 times per minute when active, but drops to just 20 beats per minute during hibernation.211k