For those who want to learn more from the master, a fascinating (albeit a somewhat challenging) read is: • Winfree, A. T.

The Geometry of Biological Time (Springer, Berlin, 1990). (5) مسألة العالم الصغير

The famous

Today

paper that everyone cites when they talk about Milgram’s work is: ⋆ Milgram, S. The small world problem.

2, 60-67 (1967).

A better reference, however, is a paper that Milgram published two years later with his graduate student, Jeffrey Travers. It contains considerably more detail than the

article, and although it isn’t quite as fun, it is actually much clearer. ⋆ Travers, J., and Milgram, S. An experimental study of the small world problem.

Sociometry,

32(4), 425-443 (1969).

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