It is used for cautionary signs and emergency rescue vehicles.
Peripheral vision is 2.5 times higher for yellow than for red.
Yellow has a high light reflectance value and therefore it acts as a secondary light source. Excessive use of bright yellow (such as on interior walls) can irritate the eyes.
The word yellow comes from the Old English word geolu.
The comic book character Green Lantern was afraid of the color yellow.
75% of the pencils sold in the United States are painted yellow.