Complex networks as dissimilar in size, age and character as a yeast cell, the World Wide Web, and the airline system of the United States all share a similar underlying structure, said Professor  of Northeastern University in an Oct. 26 talk, the first in the DES4 (Distinguished Engineering and Science Speaker Seminar Series). Barabási is known for introducing the concept of scale-free networks in 1999 using the WWW as an example. Read a news story.