And right-handed ones are more common in the south, according to a new survey. What's going on?

Quantum tunnelling of a new, third kind could finally put string theory to the test

The best of the rest from the physics arXiv this week:

The CEO of Twitter and celebrity users will appear on the popular talk show today.

Existing rail lines will be better and Chicago could be the hub of a proposed Midwestern Regional Rail System.

Metamaterial fibers that carry both light and plasmons could speed up telecommunications.

A new generation of measurements are tightening the limits on how the fine structure constant may be changing

A host of robots showcased at the RoboBusiness 2009 conference.

An ongoing debate among geneticists over the nature of common diseases.

At a conference in Boston, companies demonstrate robots for education, bomb disposal, agriculture, and more.

It's fun. But as with the original Segway, it's hard to imagine it catching on widely.

Robotic devices presented at the RoboBusiness 2009 Conference in Boston.

A pair of lungs breathes outside the body with the aid of a device codeveloped by the Toronto General Hospital, University Health Network, and Vitrolife. Prior to transplant, lungs can be preserved, assessed, and genetically repaired for up to 12 hours using the XVIVO system, according to researchers.

Japanese robot communicates using eye movements alone

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The chemistry of life may be more robust than we thought against changes in the fundamental laws of physics