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.
Norbert Rillieux was born in New Orleans, Louisiana on March 17, 1806. His parents were Vincent Rillieux, a white man, and Constance Vivant, a freed black slave. Vincent Rillieux was a successful engineer and inventor, who recognized the talent of his son at an early age and sent him to Paris for his education.