The best-known of recent cases happened in Sweden and France. In Stockholm, when Mrs. Bjoerlen gave birth on the same day to a black and a blond, blue-eyed baby, her husband refused to take financial responsibility for the child which clearly was not his. In the trial Mrs. Bjoerlen admitted to having a black lover. On the same day she had known both men. In France, Mrs. Duval also gave birth to a white and a black child, and 26 year old Marseilles prostitute, Yvette Landru, gave birth to one white, one Negro, and a Chinese.
True twins result from simultaneous fertilization of one ovum by two sperm.
The most famous case of superfetation in humans is found in the Bible account of the conception and birth of Cain and Abel. Whoever reads Genesis carefully, will see it speaks of the two seeds, or offspring, right after the fall. Not one time is Adam called the father of Cain, who is not once mentioned in the genealogies of Adam. Never is it suggested that Adam is the father of all living. Abel was killed with no offspring, therefore the record of the genealogy goes through Seth.