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Photo caption: This is a streetcar in New Orleans traveling back towards The Quarter on St. Charles Ave. I held the camera against the window sill, making sure to divide the image equally between the inside and the outside. Shot with a Nikon D700 at .8 sec @ f/20, ISO 400, Nikkor 18.0-35.0mm f/3.4-4.5 lens set at 23mm. This photo was submitted to National Geographic's 2012 Photo Contest (Places). Photographer Don Chamblee is 53 years old, and has enjoyed cameras all his life, but he didn't start to get serious until college. Now, at 53 years old, he takes photos professionally and works in stock and fine art photos. You can read more about Don at his website.

(PhysOrg.com) -- Researchers at Rice University are using carbon nanotubes as the critical component of a robust terahertz polarizer that could accelerate the development of new security and communication devices, sensors and non-invasive medical imaging systems as well as fundamental studies of low-dimensional condensed matter systems.

GPS is handy for finding a route, but it might be able to solve fundamental questions in physics too. An analysis of GPS satellite orbits hints that Earth is heavier than thought, perhaps due to a halo of dark matter.

Strange signals picked up from black holes and distant supernovae suggest there's more to space-time than Einstein believed.

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