Why Do We Need Salt?
The body of a human being contains about 47 liters of water. In fact, many of our organs have an amazingly high water content.
What Is Nitrogen?
All living things are constantly searching for nitrogen in a form their bodies can use. Nitrogen makes up an important part of the bodies of humans, plants, and animals. Nitrogen is a necessary part of the protein substance which is man’s bodybuilding material.
Who Invented The Submarine?
Man’s desire to be able to travel underwater goes back a long, long time. But the first craft actually designed to travel in this way of which we have a record goes back to 1578.
What Is The Difference Between Fruits And Vegetables?
The word “fruit” usually describes any fleshy part of a plant that has developed from a flower and has seeds. Vegetables are herbaceous plants. An herbaceous plant is one that has a soft stem and little or no woody tissue. According to botanists, the part of a plant that carries seeds is its fruit.
Who Was Copernicus?
Sometimes a man comes along who changes our whole way of looking at life and the universe around us. Such a man was Nicolaus Copernicus, a Polish astronomer who lived from 1473 to 1543. Astronomers used to believe that the earth was the centre of the universe.