A heart bypass operation relies on the talents of a surgical team but they can't do it alone - they need the help of a heart-lung bypass machine to keep the patient alive. This machine keeps the chest organs motionless while a continuous supply of oxygen and nutrients is pumped through the circuit. Watch the procedure above and witness the tense moments between life and death.

Animation developed by Visible Productions, Inc.

After years of trying to get pregnant, doctors told Kelsi Pierce it would be near impossible for her to conceive a child. However, Kelsi got the surprise of her life when her mom volunteered to be her surrogate — and she found out she, too, was pregnant!