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
× Pachyveria glauca 'Little Jewel' best in desert and arid climates, and grow well in porous, well-drained soil. They grow well in full sun, though prefer a bit of shade in more sizzling heat of 92 and higher degrees Fahrenheit (33 degrees Celsius). They are drought and heat wave tolerant, but love lots of summer time water, and hardy to around 30-35 degrees Fahrenheit (-1 to 1 degrees Celsius). × Pachyveria glauca 'Little Jewel' "× Pachyveria glauca" 'Little Jewel' succulent plants are hybrids in the nothogenus × "Pachyveria" ("Pachyphytum" and "Echeveria"). It is a versatile plant, thriving in the (frost free) garden and in containers.