• Going grey
  As people get older, the amount of pigment (melanin) available to ...

• Amazing But True
  The oldest person on record was Shigechiyo Izumi of Japan. He died in ...

• Getting together
  For a baby to form, a sperm cell from a man must join with a woman's ...

• DID YOU KNOW?
  Egg cells are the biggest human cells. Ten would fit across a ...

• At a stretch
  The mother's uterus is made of strong muscle. It has to stretch as ...

• Life support
  In the uterus, the baby gets food and oxygen from an organ called the ...

• Blood boom
  During pregnancy, the amount of blood in a mother's body may increase ...

• Amazing But True
  The most babies ever born to one mother is said to be 69. Between ...

• Boys and girls
  Inside your cells are tiny threads, called chromosomes. These carry ...

• Blue genes?
  The instructions in your chromosomes are called genes. Half come from ...