There is a device that can permanently replace the function of your heart. Side effect- you have no pulse.
There are people walking around with two hearts.
There exists a Broken Heart Syndrome that could potentially kill you.
A turtle heart continues to beat even after separating it from the body.
A snake can go a year without food if it digests its own heart and after a good meal the heart will grow back.
Women’ hearts beat faster than men’s.
Your heart beats over 100,000 times per day.
A shrimps heart is in it’s head.