sciencehabit writes with an intriguing story about the potential of figuring out where people have been by examining their hair: "That's because water molecules differ slightly in their isotope ratios depending on the minerals at their source. Researchers found that water samples from 33 cities across the United State could be reliably traced back to their origin based on their isotope ratios. And because the human body breaks down water's constituent atoms of hydrogen and oxygen to construct the proteins that make hair cells, those cells can preserve the record of a person's travels. Such information could help prosecutors place a suspect at the scene of a crime, or prove the innocence of the accused." Or frame someone by slipping them water from every country on the terrorist watchlist.

In addition to car exhaust and road grime, travelers along Highway 150 in North Carolina can now enjoy the smell of a barbecue thanks to a new billboard. The work of ScentAir, which provides custom scents for businesses, the advertisement for a local grocer emits the smell of charcoal and black pepper over the highway. "Marketing director Murray Dameron said the beef scent was emitted by a high-powered fan at the bottom of the billboard that blows air over cartridges loaded with BBQ fragrance oil. 'It smells like grilled meat with a nice pepper rub on it,' he explained."

Ant notes a piece up on WBUR Boston addressing theories to explain the universal human experience that time seems to pass faster as you get older. Here's the 9-minute audio (MP3). Several explanations are tried out: that brains lay down more information for novel experiences; that the "clock" for nerve impulses in aging brains runs slower; and that each interval of time represents a diminishing fraction of life as we age.

Hugh Pickens writes "In the aftermath of Microsoft's recent decision to contribute 20,000 lines of device driver code to the Linux community, Christopher Smart of Linux Magazine talked to Linus Torvalds and asked if the code was something he would be happy to include, even though it's from Microsoft. 'Oh, I'm a big believer in "technology over politics." I don't care who it comes from, as long as there are solid reasons for the code, and as long as we don't have to worry about licensing etc. issues,' says Torvalds. 'I may make jokes about Microsoft at times, but at the same time, I think the Microsoft hatred is a disease. I believe in open development, and that very much involves not just making the source open, but also not shutting other people and companies out.' Smart asked Torvalds if Microsoft was contributing the code to benefit the Linux community or Microsoft. 'I agree that it's driven by selfish reasons, but that's how all open source code gets written! We all "scratch our own itches." It's why I started Linux, it's why I started git, and it's why I am still involved. It's the reason for everybody to end up in open source, to some degree,' says Torvalds. 'So complaining about the fact that Microsoft picked a selfish area to work on is just silly. Of course they picked an area that helps them. That's the point of open source — the ability to make the code better for your particular needs, whoever the "your" in question happens to be.'"