Studies of this trait in response to an event in Lagerlunda led Frithiof Holmgren to develop his namesake wool. A book titled for this trait, which analyzes both lytico-bodig disease in Guam and the prevalence of this trait on the Pingelap Atoll, is by Oliver Sacks. By analyzing Homeric epithets, William Gladstone dubiously concluded that the Ancient Greeks (10[1])had this trait. (-5[1])Mark Zuckerberg’s (10[1])possession of a (10[1])form of this trait partly inspired Facebook’s logo. This trait was historically called Daltonism in reference (10[1])to (10[1])John (-5[1])Dalton, who had a form of it called deuteranopia. (10[1])This trait can be detected via an Ishihara test, in which a number is written in a circle of dots. (10[1])For 10 points, what trait that can be caused by missing or deficient cone cells includes the congenital “red–green” form? ■END■ (10[1])