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.
They also invented torpedoes which were propelled by small electric motors, thereby introducing one of the most dangerous weapons in the world. Submarines are also called U-boats, which is short for Unterseeboot, the German word for undersea boat. The first nuclear-powered submarine, the USS Nautilus (SN-571), was launched in 1955.