Heart symbols in cartoons and emoji do not look like an actual human heart. In reality, the heart is more spherical in shape, except it's narrower at the bottom than the top.

A quiet revolution in care is helping patients with cardiac amyloidosis, a form of heart failure that long stumped doctors.

Aortic stenosis is a narrowing of the heart valve that directs blood from the left ventricle into the bloodstream. In cardiac amyloidosis, misfolded proteins are deposited in the heart muscle.