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.
1 Venus is the planet which is closest to the Earth and is a little smaller than the Earth. 2  The diameter of the Earth (the distance right round the middle of the Earth at the equator) is 12,760 kilometres, or 7926 miles.3  The diameter of Venus is 12,103 kilometres, or 7520 miles. Venus is called after the Roman Goddess of love and beauty. 2  Venus is the planet which is closest to the Earth and is a little smaller than the Earth. 3  The diameter of the Earth (the distance right round the middle of the Earth at the equator) is 12,760 kilometres, or 7926 miles.