Great Wall of China "even longer"

In a two year study, researchers discovered that the actual length of the Great Wall is 5,500 miles. This is 500 miles longer than previously thought. The discrepancy was due, in part, to some areas being concealed by sandstorms. The sections were discovered using infrared technology.





http://news.bbc.co.uk/nol/ukfs_news/hi/newsid_8000000/newsid_8008100/8008108.stm