NASA's Curiosity rover has found the first real proof of organic molecules, the building blocks of life, on the surface of Mars.
The little rover drilled the sample from the clay of what scientists think was an ancient Martian lakebed as it trundled about investigating Mars' Gale Crater, but it took a team of scientists, NASA's Sample Analysis at Mars (SAM) team to analyze and make a determination of what it found.
These scientists are warning that this doesn't necessarily mean there once was...
