When your mother was born, she was already carrying the egg that would become you.

Masturbating improves the fitness of a man's sperm by getting rid of old sperm, as younger sperm have a higher likelihood of insemination.

During pregnancy if the mother suffers organ damage, the baby in the womb sends stem cells to repair the damaged organ.

Shorter women have shorter pregnancies.

True - see here

A rare disorder named 'Pica' causes a person to have an appetite for soap, coal, chalk, paper, or other non food items.

The old wives' tale that pregnant women with heartburn are more likely to birth babies with full heads of hair? Totally true.

True - see here

The longest human pregnancy was over 1 yr