TEDxChange on Thursday will host a live, 90-minute webcast, convened by Melinda Gates, co-chair of the Bill & Melinda Gates Foundation, and hosted by TED curator Chris Anderson. According to the TED website, the webcast, scheduled to begin at 11:30am EDT, will examine the questions, “Why should we, as a society, continue to invest in global health and development? How can we work across borders and political boundaries to make positive change? And what returns can we expect on our investments?” (4/5).