Are your hormones to blame for your relationship squabbles? Dr. John Gray explains why men and women are so different. Learn about the new research that supports Dr. Gray’s claims.

Click here to read an excerpt from his book: Venus on Fire, Mars on Ice.

Click here to watch Part 1.

Click here to watch Part 3.

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.