Piaget's theory of cognitive development is a comprehensive theory about the nature and development of human intelligence. It was first developed by a Swiss developmental psychologist, Jean Piaget (1896–1980). Piaget believed that one's childhood plays a vital and active role to the growth of intelligence, and that the child learns through doing and actively exploring. The theory of intellectual development focuses on perception, adaptation and manipulation of the environment around them. It is primarily known as a developmental stage theory, but, in fact, it deals with the nature of knowledge...

Mitral valve prolapse (or floppy mitral valve syndrome, systolic click murmur syndrome or billowing mitral leaflet) is a valvular heart disease characterized by the displacement of an abnormally thickened mitral valve leaflet into the left atrium during systole. It is the primary form of myxomatous degeneration of the valve. There are various types of MVP, broadly classified as classic and nonclassic. In its nonclassic form, MVP carries a low risk of complications and often can be kept minimal by dietary attention. In severe cases of classic MVP, complications include mitral regurgitation, infective...