British computer scientist Peter Kirstein (L) speaks with fellow computer scientists Stephen Casner (R) and Israeli-born Danny Cohen at the grand opening of the Kleinrock Internet Heritage Site and Archive in 3420 Boelter Hall at UCLA in Los Angeles, October 29, 2011. Kirstein was a leader in the international development of the Internet who in 1973, established one of the first two international nodes of the ARPANET. Casner and fellow researcher Cohen, working at the University of Southern California, designed and implemented protocols and software for some of the earliest experiments with packet voice using the ARPANET. REUTERS/Fred Prouser