The silk is a liquid protein produced in hundreds of glands in the spider's abdomen. It is squeezed out though a pair of nozzles and hardens to silk as it is drawn into the air. A strand can measure as little a one millionth of an inch in diameter and was once used as cross hairs in airplane bombsights. The pupil of your eye expands as much as 45 percent when you look at something pleasing. Your eyes account for 90 to 95 percent of all your sensory perceptions.
Blue eyes are the most sensitive to light, dark brown the least sensitive.
Seven in 100 men suffer from color blindness but only one in 1,000 women suffer from it. The lens of your eye continues to grow throughout your life. But as it grows larger, its ability to focus is reduced. A mild noise will cause your pupils to dilate. A sneeze can travel at 100 miles per hour.