Following the Asian tsunami, scientists struggled to explain reports that primitive aboriginal tribesmen had somehow sensed the impending danger in time to join wild animals in a life-saving flight to higher ground. A new theory suggests that the anterior cingulate cortex, described by some scientists as part of the brain's "oops" center, may actually function as an early warning system -- one that works at a subconscious level to help us recognize and avoid high-risk situations.

Vehicles that move slowly down the street, pausing regularly to take photographs with remote-controlled cameras, tend to make the police a bit nervous. But one trailer loaded with imaging equipment that made its way through the streets of central Philadelphia wasn't spying - although at first, Secret Service agents had their doubts.

Both the vehicle and a plane that flew over the same area were taking authorized pictures of each building and its surroundings, at the behest of the downtown improvement district. Now the terabytes of imaging data are being used to build a three-dimensional model of central Philadelphia, down to the last cornice, mailbox and shrub.

The city model can then be integrated with other information, like listings of shops and rental space, so that one day people who'd rather be in Philadelphia will be able to be there virtually, from their computers. Apartment seekers, for example, will be able to click their way through the neighborhood, taking a virtual walk and checking out the view from the windows of apartments that strike their fancy.