On this week’s Tech Nation, Ann Mei Chang, the Executive Director of Lean Impact, before a live audience at the Women in Leadership and Philanthropy Symposium at the University of San Francisco. Her book is “Lean Impact … How to Innovate for Radically Greater Social Good”. And Jerry Sheehan, the Deputy Director of the National Library of Medicine at NIH - the world’s largest medical library, founded in 1836 as a bookshelf in the office of the Army Surgeon General.