But now researchers led by Doctor Jonathan Winickoff at MassGeneral Hospital for Children in Boston are warning about what they call "third-hand smoke."

VOA: special.2009.01.07

Unfortunately, she clicked yes, and this fake-security warning led to her computer becoming as infected as a little kid after the first day of preschool.

FORBES: Is Your Computer Enslaved to a Spammer?

The moderator also criticised negative public attitudes to prisoners, particularly sex offenders, warning that it led to offenders being victimised at the expense of their needs and those of their victims.

BBC: Moderator to visit Lockerbie prison

U.S. Homeland Security chief Tom Ridge said Tuesday that a "confluence" of information from intelligence sources led to the warning.

CNN: Information from Canada helped lead to alert, official says