Choose To Believe: A Practical Guide to Living Your Dreams

Is there a science of faith?
For thousands of years, mystics and religious leaders have told us that if we have enough faith, anything is possible. Pop psychology is full of authors expounding the same philosophy - you'll see it when you believe it.
If this is true, then where is the scientific evidence?
And if the evidence exists, then why isn't it obvious?
And why do so many who try to use the Power of Faith fail?