When did Stephen hawking say his quote the greatest enemy of knowledge is not ignorance it is the illusion of knowledge?

What kind of sensory receptors are associated with hair follicule? When Mount Everest wasn't discovered yet what was the highest mountain? What are the rocks found in ones head? How many alleles does a normal gamete have? Is methane balanced or unbalanced? Did hurricane bill and grace hit the us in 2009? Is thyroxine a cure for thymus problems? What role did observation play The work of Greek scientist? Does oil poison plants? What is the largest whitetail? How long does it take to grow hydroseed? What is Either of two distant minerals nephrite and jadeite? The water cycle is the movement of water from Earth's surface to the atmosphere and back to Earth's surface. Why do many living organisms depend on the water cycle? How would biodiversity be affected if coral died? A yeast cell multiplies itself by a method called? What mineral has metalic luster silver color black streak and contains iron? What does it mean the chromatin again becomes diffuse? When was dnb invented? Is the element element conduct eletricity? Is water non electrolyte?