Fahrenheit reference points became popular following the work of Anders Celsius and these fixed points were adopted by a committee of the Royal Society led by Henry Cavendish in 1776. Under this system, the Fahrenheit scale is redefined slightly so that the freezing point of water is exactly 32 °F, and the boiling point is exactly 212 °F or 180 degrees higher. It is for this reason that normal human body temperature is approximately 98° (oral temperature) on the revised scale (whereas it was 90° on Fahrenheit's multiplication of Rømer, and 96° on his original scale). The Rankine temperature scale was
100 Degrees 24 November. In a statement, Kylie said: "I'll be bringing a little Christmas cheer to The X Factor stage, I can't wait to come home and perform on the show with Dannii". The performance was their first performance together since their live performance of "Kids" on her in 2006, and the first televised performance together since they performed "Sisters Are Doin' It for Themselves" on Young Talent Time in 1986. Kylie wrote "100 Degrees" about adapting to a winter Christmas in the UK after being raised in Australia and was inspired by Donna Summer's vintage disco classics. Dannii said; "There's