In this week’s Medical Discovery News: Life expectancy in the United States ranks 40th in the world with 77.97 years. That addresses when someone might die but what about how? Most likely, it will be from one of these top 10 causes. MDN is hosted by professors David Niesel at UTMB and Norbert Herzog at Quinnipiac University. Learn more at www.medicaldiscoverynews.com. The column also appears in the Abilene Reporter-News.