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.

Click here to watch Part 2.

Click here to watch Part 3.

Whether it's falling or flying, Dr. Oz has the answers to why you have the dreams that you do and what they might mean.