And the Freedom Tower, which will be built on the World Trade Center site, is designed to be taller than the original complex.

FORBES: World's Tallest Towers

Tracing an attack to its original source can be complex in the extreme, he adds.

BBC: South Korea network attack 'a computer virus'

The IRS seems to be pulling out the stops to encourage more taxpayers to come clean and join its 2011 offshore voluntary disclosure initiative by the Aug. 31, 2011 deadline. (See our original blog detailing the program.) These filings are very complex and have many unintended consequences.

FORBES: IRS Goes Kinder And Gentler In Disclosure Initiative, Still Has Fangs

Art historians at the University of Chicago have digitally recreated another Buddhist cave temple complex at Xiangtangshan in northern China, where many of the site's original sculptures have been lost or removed.

BBC: Digital Chinese caves preserve history