Lensless glasses are a real trend — These purely fashion glasses have no lenses at all and are worn as style accessories in some parts of Asia and by fashion brands, with benefits like no fogging or reflection.
Butterflies have good eyesight within 10-12 feet, but any farther, things look blurry. They also must rely on ultraviolet colors (invisible to the human eye) to find mates and the right flowers.
Ninjas used a system called Goshiki-mai, meaning Five Colored Rice, in which rice grains were painted red, blue, yellow, black or purple in order to leave coded messages or trails.
Constantinople, the capital of the Byzantine Empire, fell to the Ottoman Empire on May 29, 1453. This event marked the end of the Byzantine Empire and is considered one of the key events that signified the end of the Middle Ages.
