The banner, with its horizontal red, black and green stripes, was adopted by the Universal Negro Improvement Association (UNIA) at a conference in New York City in 1920.

Forget the 'dress’ illusion, there’s a new trick that can make you see black and white as green and red for up to three and a half months. The McCollogh effect was discovered by an American ...

Richard Pelham / Getty Images "Green, yellow and black are much more popular in Africa. That may be an anti-colonial reaction to the red, white, and blue of the colonial powers," Kaye says.

The McCollough effect was found by a psychologist in Canada in 1965, and explained by Tom Scott in a video on YouTube (shown). It involves staring at a black and white test image for up to a ...

If you see a rock that is 100% white, it is not granite but more likely a man-made rock that is created to look like granite or a quartz (quartzite) countertop. Black Granite ...