God's book has always told us this fact. Then He brought him outside and said, Look now toward heaven, and count the stars if you are able to number them. And He said to him, So shall your descendants be. God was telling Abraham that just as the stars in the heavens cannot be numbered, Abraham's descendants would be more than could be numbered. Another example of how science and the Bible agree relates to the blood in our bodies.
Man now knows that blood is necessary for survival.
If our bodies lose too much blood, we will die. However, man did not discover this principle until the 19th century. Before that time, blood-letting was practiced, and many died because draining blood from their bodies drained the very source of life. George Washington, the first President of the United States, is said to have died in this way. Moses, again writing by inspiration hundreds of years ago, told us something man did not know until much later.