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.
On average, Venus is the nearest, but depending on where Earth and Venus are in their orbits, the distance varies from 38 million to 261 million kilometers. Mars is the other nearby planet and its distance from Earth varies between 55 million and 401 million kilometers.