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.
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.
The brain of adult men is approximately 10% larger than that of women. Because men are typically taller and have more muscle mass than women, their brains require more neurons to control the body.
