It is important not to confuse IMC with IFR (instrument flight rules) â IMC describes the actual weather conditions, while IFR describes the rules under which the aircraft is flying. Aircraft can (and often do) fly IFR in clear weather, for operational reasons or when flying in airspace where flight under VFR is not permitted; indeed by far the majority of commercial flights are operated solely under IFR.
Norbert Rillieux. Norbert Rillieux (1806-1894) was the inventor of the multiple-effect vacuum evaporator, which revolutionized the processing of sugar. He gained recognition as one of the prime architects of the modern sugar industry.
One of the first sunscreens was invented by chemist Franz Greiter in 1938. Greiter's sunscreen was called Gletscher CrÃ¨me or Glacier Cream and had a sun protection factor (SPF) of 2. The formula for Glacier Cream was picked up by a company called Piz Buin, named after the place Greiter was sunburned and thus inspired to invent sunscreen.