mental illness â(countable and uncountable, plural mental illnesses) ( 1 uncountable) The property of being mentally ill; mental disorders taken as a whole.  2006, R. Keith Sawyer, Explaining Creativity: The Science of Human Innovation, Oxford University Press US, ISBN 9780195161649, page 87:
The first Valentine's Day box of chocolates was introduced by who? Richard Cadbury introduced the first Valentine's Day box of chocolates in the 1800's. Source:(Fun facts about Valentine's Day , msn lifestyle) ..
Many people credit this as the very first chocolate bar for eating. John Cadbury added a similar product to his range in 1849, and by today's standards these original chocolate bars would not be considered very palatable. The early eating bars of chocolate were made of bittersweet chocolate. Milk chocolate was introduced in 1875 when Henry Nestle, a maker of evaporated milk and Daniel Peter, a chocolate maker, got together and invented milk chocolate. In 1879, Rodolphe Lindt thought to add cocoa butter back to the chocolate.