Aortic regurgitation (AR) may occur due to damage to the aortic valve leaflets or as a result of dilation of the aortic annulus. As the disease progresses, symptoms of heart failure eventually occur.

From a distance, you might mistake Picasso shield bugs for little Easter eggs. But why are the insects so colorful, and what do they have to do with Picasso? PETBOOK author and biologist Saskia ...