When Former Marine Victor Burk reflects on his life, it reveals his time in the corps prepared him to take on the classroom.

"SDB is associated with poor academic performance, specifically language, arts, math, science, and learning problems," the researchers wrote. "A recent, comprehensive, and high-quality meta-analysis ...

"We let him work on it a bit before we recognized his deep breaths as he was getting stressed and starting to tear up," Patrick and Kitty told Newsweek.