Eyeglasses made of nylon were introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides). Today's blended nylon frames are both strong and lightweight.
Venus is the closest size to Earth and is sometimes called Earth's sister planet.. Its diameter is 95% of Earth's but its mass is only 81% as much.
Venus also happens to be the planet whose: -- orbit is closest to the size of earth's orbit -- minimum distance from earth is the least -- appearance in our sky is brighter than any other object except the sun and moon -- mass is closest to the earth's mass -- density is closest to the earth's density. Venus.