This week we focus on heart dis­ease, heart fail­ure, what blood pres­sure is and why it’s bad when it’s high. Host Rachelle Saun­ders talks with physi­cian, clin­i­cal researcher, and writer Haider War­raich about his book ​“State of the Heart: Explor­ing the His­to­ry, Sci­ence, and Future of Car­diac Dis­ease” and the ails of our hearts.