He is perhaps best known for his honesty — but a lesser-known fact about Abraham Lincoln is that the 16th president of the United States battled severe depression during his lifetime. Dr. Chris Tuell, a clinical psychotherapist and a chemical and behavioral addiction specialist at the University of Cincinnati College of Medicine, has studied Lincoln’s mental health struggles extensively. "Though the history books play a significant role in our perception and understanding of the ‘rail splitter’ from Illinois, it often becomes easy for us to forget that Abraham Lincoln was very human," Tuell told Fox News Digital. "Lincoln led this...