Color The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the study of the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what is commonly referred to simply as "light"). Electromagnetic radiation is characterized by its wavelength (or frequency) and its intensity. When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 700 nm), it is known as "visible light". Most light
Media and LGBTQ youth of colour in the United States youth worldwide. The hashtag was used by a diverse community on a number of platforms, including Instagram, Facebook, Twitter and YouTube. Many young teens shared their stories and created an Instagram channel. Movements such as the #40toNoneDay raised awareness regarding youth-of-color homelessness, particularly in the LGBT community. Sara Ramirez, who plays a bisexual doctor on "Grey’s Anatomy", advocates the movement to bring attention to the 40 percent of homeless youth who identify as part of the LGBT community; LGBT youth are less than seven percent of the general youth population. Representations of, and expressions by, LGBTQ youth of colour can