Unexpected side effects - Edward Tenner

View full lesson: http://ed.ted.com/lessons/unintended-consequences-edward-tenner Every new invention changes the world -- in ways both intentional and unexpected. Historian Edward Tenner tells stories that illustrate the under-appreciated gap between our ability to innovate and our ability to foresee the consequences. Talk by Edward Tenner. Learn more about your ad choices. Visit megaphone.fm/adchoices