Science: Two of a Kind

In the year 1582 a William Shakespeare married an Anne Hathaway. Little is known of the progress of their union, but of their progeny, one fact is certain: Mrs. Shakespeare gave birth to twins. Doubtless this fact, if it did not inspire, at least aided the playwright in accurately describing the behavior of twins as he did in Twelfth Night, as he did again in The Comedy of Errors.

Whatever may have been the reasons for his writing about twins in these plays and others, it was a fortunate compulsion. Twins, are among the most engrossing of human phenomena. Twins are principal...

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