Here's a philosophical question for you. If a color doesn't have a name, can we still see it? Many years ago, the human eye evolved to give us the ability to see about a million colors. That's a lot.

The Blue Plaque, which has been awarded for 159 years by the London Society of the Arts in partnership with English Heritage, ...

A previously unknown painting by Pablo Picasso has emerged from the shadows of history, hidden beneath a Blue Period ...

The term mental hygiene has a long history in the United States ... to help individuals and families maintain their mental health by teaching people constructive tolerance for individual differences.