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.
Are Venus's and Earth the same size? Venus is known as the Earths sister mainly because of their similarity in size. Earths diameter is 12,756 kmVenus diameter is 12,104 km This means the Earth is about 1.05 larâ¦ger than Venus.