In preparing the public for a disaster, officials want to make the right call, but they also want to avoid blame. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images

Hugh Herr is a biophysicist and rock climber. He is the holder or co-holder of 10 patents related to prosthetic devices. Len Rubenstein/Crown Business hide caption

itoggle caption Len Rubenstein/Crown Business