Copper sheathing<span> is a practice of protecting a under-water hull of a ship or boat from the corrosive effects of salt water and bio fouling through the use of </span>copper<span> plates affixed to the outside of the hull.
It was pioneered and developed by the Royal Navy during the 18th century.
If you find a machine which goes in a speed of 3×10^8 m/sec, you can see the past and future. You can even travel for longer distant objects like stars
