In some industries, sex sells. In the science journalism industry, however, potentially killer asteroids sell even more. Due to a quirk of how NASA refers to the many asteroids it tracks, countless headlines such as "Massive and Potentially Dangerous Asteroid Will Approach Earth Tonight" and "'Potentially Hazardous' Asteroid to Pass by Earth on Super Bowl Sunday" fill Google News every month. Those aren't tabloids - they're from Newsweek and New York Magazine, respectively. The problem is, NASA's definition of "potentially hazardous" isn't the same as the general public's.