The mers were also designed to reproduce only at long intervals, in order to maintain the natural balance of the environment in which they were placed.

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Works
Vinge's first publiJoan D. Vinged story "Tin Soldier" a novelette appeared in Orbit 14 in 1974. Her novel Psion was named a Best Book for Young Adults by the American Library Association. Heinlein in part dedicated his 1982 novel Friday to Joan.

Vinge (pron. : /ˈvɪndʒi/; born 2 April 1948 in Baltimore Maryland as Joan Carol Dennison) is an American science fiction author.