Oprah says anyone can change the way they think.

1 of 15
How well do you think you know yourself? Would you be willing to take a 10-minute test that reveals your hidden feelings about people of different races, religious faiths, weights and sexualities? What would you do if the test exposed prejudices you didn't even know you had?

Finding out that you harbor hidden prejudices can be alarming. These guests have hopeful news: With effort, anyone can change the way they think.