High-Tech Barriers to Cross-Border Mobility
/Extracted 12AUG2011 from http://www.spiegel.de/international/world/0,1518,779162,00.html
On the eve of the 50th anniversary of the construction of the Berlin Wall on Aug. 13, 1961, SPIEGEL ONLINE correspondents recount the history of modern walls in Northern Ireland, Israel, Mexico, North Africa and Korea.