Science: Were We Planted Here?

After winning the Nobel Prize for helping to discover the structure of DNA, the master molecule of life, what does a scientist like Francis Crick do for an encore? He tackles something even bigger. With Leslie Orgel, of California's Salk Institute, Crick has now taken on the mystery of the origin of life. Writing in Icarus, a monthly devoted to studies of the solar system, the two scientists theorize that life on earth may have sprung from tiny organisms from a distant planet—sent here by spaceship as part of a deliberate act of...

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