Rich in vitamin K, vitamin A and vitamin C along with other vital nutrients, the health benefits of kale include detoxification, heart support, cancer prevention and a number of others covered in this article. Health Benefits of Kale in History.
A U-boat is a type of submarine invented by the Germans for use in World War I and II. The initial U in U-boat stands for unterseeboot, or undersea boat in English. Holland housed a Submarine Development Bureau in 1922 that was made to look like a regular shipbuilding company.
The Germans used the U-boat as a way of fighting back against the Royal Navy, which was far superior in size and could operate almost anywhere, unlike the German Navy surface fleet. During World War One, U-boats were responsible for sinking about 5,000 ships and killing about 5,000 men in combat.