March 25 (UPI) -- The NASA rover "Curiosity" discovered what scientists say is the largest ever seen organic molecules on Mars, raising speculation about if life was created billions of years ago on the Red Planet. "Our study proves that, even today, by analyzing Mars samples we could detect chemical signatures of past life, if it ever existed on Mars," stated Caroline Freissinet, the study's lead author and research scientist at France's National Centre for Scientific Research in the