When Watts looked into the history of "the greatest painting of all time", he discovered that, for most of its life, the "Mona Lisa" remained in relative obscurity.
Hodge said the site, which started life in Denmark in 2002, was investigating the origins of the virus but said it appeared to have been planted by a disgruntled member of staff.
If the Burj Khalifa shows that memories of property cycles are short, the Fannie Mae survey suggests that some of the lessons are never taken on board at all.
Last year a hijacked Ukrainian ship with a cargo of tanks bound for South Sudan was also carrying 10,000 AKs and ammunition, according to the Small Arms Survey, a Swiss-based pressure group.
The best tourists in the world are the Japanese, followed by Americans and the Swiss, a survey based on views from hoteliers across Europe said Wednesday.
"Our investigators will pull films, they will examine the medical records and they will interview relevant staff," said Claudia Hutton, the department's director of public affairs.
Mr Hutton stresses that his inquiry will be independent, but accepts that public pensions must be affordable and reflect the demographic and financial pressures felt so keenly in the private sector.