NASA's about to test a safer rocket fuel for the first time ever

The fuel that powers most spacecraft today is incredibly toxic to living organisms. That's normally not a big issue when you're sending something into space, but it can still pose some risks if a mishap results in a spacecraft crashing back down to Earth. It's also a major obstacle for engineers who work closely with space-bound hardware on a daily basis. NASA thinks it might have a fix for all of this in the form of a new, "green" fuel alternative that swaps highly toxic hydrazine with a new fo...