Why do we get goosebumps? Why do men fall asleep after sex? Do we really shrink as we age? Dr. Oz demystifies the body’s mysterious processes and reactions. If you’ve ever wondered why, now you can find out. Click here to quiz yourself on more of your body's medical mysteries.

Click here to watch Part 2. 

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.