The definition of the meter (m), which is the international unit of length, was once defined by a physical artifact - two marks inscribes on a bar of platinum-iridium. Today, the meter (m) is defined in terms of constant of nature: the length of the path traveled by the light in vacuum during a time interval of 1/299, 792, 458 of a second. The Length - Evolution from Measurement Standard to a Fundamental Constant explains the evolution of the definition of the meter.
Rainbow flag (LGBT movement) For other uses, see rainbow flag. The rainbow flag is a symbol of lesbian, gay, bisexual, and transgender (LGBT) pride and LGBT social movements in use since the 1970s. LGBT symbols. The rainbow flag, commonly the gay pride flag and LGBT pride flag, is a symbol of lesbian, gay, bisexual, and transgender (LGBT) pride and LGBT social movements.
People wave a huge rainbow flag during the 35th Gay Pride Parade in downtown Caracas on June 30, 2013. You've seen it on buildings, bumper stickers, and front lawns, and you've waved one at parades, rallies, and protests. You know the Pride flag well, but what is the meaning of the rainbow flag? Its history is as interesting as it is colorful. From peâ¦