Failure is not an option. It’s a phrase that many people attribute to Apollo 13 Flight Director, Gene Kranz. While he never actually said it at the time, it’s an idea that has always been at the core of the manned space flight program. Here is the best example. This is the filter device assembled by engineers at NASA and used by the astronauts aboard Apollo 13 to help bring them back home. You want to see how impossible happens? This is a shining example.