Find out what has our nation's bio-terror experts most worried. Is America really prepared for large-scale germ warfare? Dr. Oz walks you through a deadly scenario. Learn what you can do to stay safe. Click here to take the first aid quiz and see how well you’d do in an emergency.

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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!