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Authority is the right to exercise power, which can be formalized by a state and exercised by way of judges, appointed executives of government, or the ecclesiastical or priestly appointed representatives of a God or other deities. Authority, in the sense of "authorization", can also mean the right to complete an action or execute an order. In government, authority is often used interchangeably with power. However, their meanings differ: while power is the ability to order or accomplish a goal or to influence others, authority refers to a claim of legitimacy, the justification and right to exercise that power. For example, while a mob may have the power to punish a criminal by beating or lynching, the rule of law indicates that only a court of law has the authority to determine and refer a criminal for punishment. In this sense, authority is a matter of not only the ability or power to make decisions, but the right to make these decisions and execute them with commensurate power. Appropriate authority is the basis of good government in the republican conception of government, which finds much of its theoretical origins in ancient Rome.
The dress is a photograph that became a viral internet sensation on 26 February 2015, when viewers disagreed over whether the dress pictured was coloured blue and black, or white and gold. The phenomenon revealed differences in human colour perception, which have been the subject of ongoing scientific investigations into neuroscience and vision science, with a number of papers published in peer-reviewed science journals. The photo originated from a washed-out colour photograph of a dress posted on the social networking service Tumblr. Within the first week after the surfacing of the image, more than 10 million tweets mentioned the dress, using hashtags such as #thedress, #whiteandgold, and #blackandblue. Although the actual color was eventually confirmed as blue and black, the image prompted many discussions, with users debating their opinions on the colour and how they perceived the dress in the photograph as a certain colour. Members of the scientific community began to investigate the photo for fresh insights into human color vision. The dress itself, which was identified as a product of the retailer Roman Originals, experienced a major surge in sales as a result of the incident. The retailer also produced a one-off version of the dress in white and gold as a charity campaign.
Leggings refer to several types of leg coverings. Modern usage from the 1960s has come to refer to elastic close-fitting garments worn over the legs typically by women, such as leg warmers or tights. Usage from the 18th century refers to men's wear, usually made of cloth or leather that is wrapped around the leg down to the ankle. In the 19th century, leggings usually referred to infants' leg clothing that were matched with a jacket, as well as leg-wrappings made of leather or wool and worn by soldiers and trappers. Leggings prominently returned to women's fashion in the 1960s, drawing from the form-fitting clothing of dancers. With the widespread adoption of the synthetic fibre Lycra and the rise in popularity of aerobics, leggings came to further prominence in the 1970s and '80s, and eventually made their way into streetwear. Leggings are a part of the late 2010s athleisure fashion trend of wearing activewear outside sporting activities and in casual settings, which became a contentious social norm in the United States.