What would you do to live to 150?
If planaria are sliced perpendicular to the axis, the individual pieces will regenerate into complete worms.... If the head is sliced parallel to the axis, two complete heads form.... Other species of planaria reproduce asexually, with the tail coming off and growing a head, and the head growing a tail. [Harold Morowitz, essay in The Kindly Dr. Guillotin; a fairly dull book on the whole so I won't bother linking it]
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