Many of the superstitions surrounding numbers have a basis in science and nature.
For example, early astrologers believed that seven planets governed the universe and therefore the lives of human beings.
A seventh child was thought to have special gifts.
Human life was divided into seven ages.
Every seventh year was believed to bring great change.
If a person's date of birth could be divided by seven, that person's life would be lucky.
For the ancient Babylonians, three was a lucky number because it symbolized birth, life, and death.
Some people still believe that a dream repeated three times comes true.