Building blocks of life are not life or even really close, but they are hopeful signs. NASA
has announced that the Curiosity rover has found signs of the building blocks of life, as we know it, on Mars.
These building blocks are common throughout the cosmos. Even in interstellar clouds
. To have life, as we know it, requires liquid water. Remember the signs of liquid water found on Mars back in 2011? Since then it has been convincingly argued that they may have just be flows of fine sand grains without water being involved at all. Further study continues.