(from http://www.iif.hu/~visontay/ponticulus/mesterkurzus/somlyo_a.html)

The Central Cafe in Budapest today. Karinthy wrote most of his books in this coffee and cake shop. Today it functions as a restaurant and cake shop.

(from http://www.famouslandmarks.com/leasing/preview.asp?ID=1562&mode=LARGE360)

Stanley Milgram
the Harvard researcher who in 1967 preformed a series of experiment that lead to the concept of "six degrees". 
For more information about Milgram's work, see www.stanleymilgram.com

For a recent artilce on him, see http://207.159.134.31/pt62milgram.html 

(from http://www.sheftman.com/cab1a/mihugo/index.html)

The Nature paper reporting on 19 degrees of separation on the  WWW.

[PDF]

(from http://www.nd.edu/~networks)
 

Réka Albert,
as a graduate student at Notre Dame, and the first author of the 19 degrees paper.

(At Univ. of Notre Dame)

Hawoong Jeong,
who build the search engine that mapped a portion of the web, making the 19 degrees study possible.

(At Univ. of Notre Dame, Nov. 1999)

(from Business2.0 magazine)

Steve Lawrence and Lee Giles
the two NEC computer scientists who were the first to estimate the size of the web, showing that even the fastest search engines cover only a small fraction of all webpages available on the World Wide Web. 

(from http://www.neci.nj.nec.com/homepages/giles/pictures/onlinetoday.jpg)

A poster of John Guare's Six Degree of Separation play.

(from http://www.footlightsgallery.com/imagelg/sixdeg.jpg)

The cover of the video of the Six Degrees movie, starring Stockard Channing and Will Smith, produced after the Guare's play.

(from http://www.amazon.com)