Daily Quiz, October 31, 2024 | On shades of grey

Today’s quiz focuses on shades of grey. Grey was historically associated with the poor because it was the natural color of undyed wool. The French term for a painting done in grey is “grisaille,” as seen in Picasso’s famous painting “Guernica.” During the American Civil War, one side wore grey uniforms to blend in better with the landscape. Our hair turns grey as we age when pigment cells stop injecting melanin into the hair follicles. Grey matter in the brain refers to important neuronal cells and synapses, while white matter contains myelinated axons. The quiz also mentions a metamorphic rock that produces a dark grey powder.